PredictWind Forecast and Routing

Posted by Unknown Sabtu, 27 Juli 2013 0 komentar
Application: iPhone, iPad, iPod Touch iOS 4.2 or later
Function: Weather Forecasts, Tracking and Routing
Rating: *****
Cost: App is free, $4.99 to $18.99 for forecasts

PredictWind is an app that is a follow up to the already great wind forecast and weather routing website, www.predictwind.com.  They claim to be the worlds leader in wind forecasting and weather routing.  I have to say that they do have an impressive list of sailboat racers to back them up. 

The director of the company is Jon Bilger who has a very strong sailing resume himself. His experience as weather manager for the winning Americas Cup Alinghi syndicate spawned the idea of offering this high resolution wind forecast data to sailors around the world.

In June 2008 the company's first wind forecast product was released. The iOS PredictWind app was later released and updated to version 1.2.5 in June of 2012. They also have an Android version in the Google Play store if that is your flavor.

The high resolution wind modeling software provides 8 kilometer resolution for most of the coastal areas of  North America / Canada / Mexico / Caribbean,  Europe ,  Australia ,  New Zealand /South Pacific ,  Asia , South America,  Middle East / India , South Africa , Hawaii and  Alaska.

To get started all you have to do is create an account with Predict Wind with a user name and password. Once that is done you can start to add forecast areas by selecting Add Location in the top right of the main screen.  Here you can search for and select from the many points available around the world or select a point in your immediate area.  The free version only allows a one day forecast for one location.  If you upgrade to the paid version you get up to five days of forecasts for up to 6 points and access to the web based forecast and tracking tools also.

The main screen of the app is divided into nine different selections giving you the ability to look at the wind forecasts is a variety of ways. Additional selections are available for Tables, Graphs, Maps, Contours, Observations, Alerts, Routing, Trip Planning and Tracking.

Features:
  • Cell phone, tablet and web based forecasts, tracking and routing
  • Wind forecast for 520 forecast areas and 22,000 point around the world.
  • PWG/PWC and GFS/CMC models
  • Rain, cloud and temperature forecasts
  • Sea temperature forecasts
  • 8 kilometer and 1 kilometer wind data resolution.
  • Models are created every 12 hours and available twice daily.
  • Tabular and graphical wind forecasts displays
  • Real time wind observations
  • Customizable Alert page
  • Setting for English and Metric
  • GPS Tracking map lets your family and friends track your position.
  • Trip Planner shows the best day for departure
  • Weather Routing shows the fastest route with the forecast conditions
  • Highest resolution on the web.
  • Zooming feature on high resolution forecast maps 
Tables:

The Tables format show the forecast data in a tabular format. Both the PWC and PWG models are shown to see how they compare to each other.

Wind speed, direction and wave height are displayed. Other data includes wave direction, temperatures, rainfall and cloud cover.

Wind direction can be displayed as arrows or in a compass direction format.  Simply tap the Show Arrows button in the top right of the screen.

Graphs:

The Graphs selection allows you to display the forecast data in a graphical format. Wind Speed and Direction, Rainfall and Cloud Cover, Temperature and Pressure, and Height, Direction and Period of the waves are displayed on x/y axis.

Selections for one day or five days can be made by toggling the button in the top right of the screen. Both PWC and PWG models are again shown for comparison.

Multiple Graphs for different forecast locations can be added to the chart by selecting the forecast areas at the top of the graph.  This will give you an indication of the overall wind forecast for multiple locations along your trip.

In this chart we see Wind Speed in the top chart and panning down we can see the Wind direction in the lower chart.


Forecast Wind Maps:

The Maps display has options to show the forecast winds for a one and five day time period for a local, regional, offshore and a global view.

The wind arrows are color coded to depict the different wind speeds and directions. These are much like a GRIB wind file that we are use to seeing.

The slider bar at the bottom scrolls through the forecast and the time is shown in the top middle of the screen.  The user can tap the circle on the slider bar and move it left or right to select the earlier or later forecast times.

Either of the PWG or PWC wind forecast models can be shown by selecting the button in the top right of the display.  This feature is handy to see how the two models compare. They usually correlate very well.

Contours:

The Contour map displays are another way of depicting the differences of the forecast data.  Here we see wind speed for the Tortola, BVI area with different colors depicting the various forecast wind speeds.

The slider bar at the bottom is available to view the forecast time as desired.

The Show PWC button in the top right toggles the display between the two forecast models to see the difference in forecast data.

Observations:

The Observations tab bring up a map display of the real time wind speeds in the selected area.  The wind in the Caribbean appears to be pretty light at this time.

Tapping the Gear Icon in the lower right of the screen brings up options to select Wind Speed, Direction and Wind average times of  1, 5 and 15 minutes.

The Slider Bar at the bottom of the display allows you to slide back in time and see what the wind has been doing for the last 6 or 48 hours.

Tapping the Chart Button in the lower right of the screen brings up a nice display showing the wind speed and direction for the various reporting points in the area.

If I had been zoomed into a specific area on the chart it would have displayed fewer reporting points and made the chart easier to view.

This Chart is kind of busy because it is displaying so may locations.



Alerts:

Alerts can be customized and set up to create notifications when a forecasted variable reaches a selectable maximum or minimum value.  If the forecast reaches your selected value you will be notified via your phone or tablet with a notification.

Alerts can be set up per location and per forecast value up to five day in advance.  This would work great for a kite boarder or wind surfer who want to be alerted to a specific wind speed at various locations.  Simply put in your desired wind speed and PredictWind will notify you if it is forecasted to blow at that speed at that location.  If your a sailor it could alert you to a possible high wind forecast in your area giving you a heads up on the future conditions.

Routing:

The Routing option is where this app really starts to shine.  It is great having all of this weather data but how do I apply it to my trip in the coming days or week. The app takes all this forecast data and with a few inputs from the user as to where you are going and when, it then produces an optimized weather routing for your trip.

It can be modified for power or sailboats and can also take into account the polar diagram values of your sailboat too.  Select Fastest Time to make it to your destination the quickest or Comfort to avoid sailing upwind.

As an example, I created a quick routed from the east coast to Bermuda and onto the British Virgin Islands.  This is a popular Caribbean 1500 route that many take every fall. Waypoints can be added or deleted from your route with buttons on the top right of the screen. 

Start by selecting the forecast model and start time for your trip. The route can be optimized by selecting if you are a sailing or motoring vessel. Next hit the GO button and your route will be calculated for you.

It has predicted if I leave this afternoon that the 1500 mile trip will take about 8-9 days depending on which model you use. The two different red and blue lines are for the two different weather models.

Simply scroll down on this screen to show the tabular data produced from the calculations. Data includes wind speed, direction, angle, SOG, COG and time for your entire trip.  In addition, it provides a summary, route coordinates, swell and current data along the route. This is truly the most advanced weather routing app that I have seen for an iOS device.

It would be nice if there was a way to save and export the route to another charting app or chart plotter so it could follow this optimized weather route. That could possibly be an addition in a future release.

Trip:

The trip page is another powerful tool that will help you with your weather routing.  It is most useful for determining the best weather window to depart on your selected route in the next few days. It works in conjunction with the Route that you selected for your trip. Once you select a Route, that same route shows up on the Trip page.

Use the search box to search for and set the green start arrow and red destination arrow if needed.  It is recommended not to use waypoints because that will not allow the program to calculate the optimum route. Select the power or sail options under the Boat Polar button to customize the trip to your vessel. With the route selected, hit the GO button and it will calculate the departure conditions for the next 4 days and determine what the optimum path will be.

Scrolling down below the map will show additional data about the trip. The app calculates the max, min and average wind speeds, % time sailing upwind, downwind and reaching, and % time wind blows at certain wind speeds.

One feature that would be a nice addition to the Route and Trip functions is the option to save the trip and route calculations for later reference. This would allow running various trips with different start and stop times.  With the weather forecast data changing every 12 hours these saved files may become irrelevant very quickly. 

Tracking:

The Tracking section utilizes the GPS of your phone or tablet and records the path that you have traveled. If you are using your cell phone or tablet 3G connection your tracking information will be sent back to the PredictWind website. Your friends and family can login and view your tracking progress.

GPS tracking is enabled under the Account button in the top left corner of the app's main screen.  Select Enable or Disable GPS tracking here. Recorded tracks can be deleted at the bottom of the Tracking display.  Saving more than one track would be a nice additional feature in a future release.

Final Thoughts:

The app is nicely designed and very intuitive to use.  After a few minutes I was viewing forecast and setting up alerts with no problem at all.  I like that it provides both forecast models and allows you to easily view both of the data side by side to compare the two.  I am very impressed with user interface and thought that the Routing, Trip and Tracking features were an added bonus to an already great forecast app.

If your planning a long distance cruise or just going out for the day, the PredictWind App is worth adding to your smart phone or tablet.  It puts much needed real time and forecast weather data at your fingertips along with some powerful weather routing features. PredictWind is now my "goto" app for wind and weather forecasts and it has found a permanent place on my iPhone.

~~~ Sail On ~~~ /)
Mark


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DC Wire Sizer

Posted by Unknown Minggu, 14 Juli 2013 0 komentar
Application: iPhone, iPad, iPod Touch iOS 5.1 or later
Function:
Rating:****
Cost: $2.99

I get a lot of requests from app developers to look at their products and possibly do a review on my blog.  This is a great free way for developers to reach a lot of people and get the word out. It is also a great way for me to become aware of new and useful apps.

I got a nice email from Julia asking me to look at her recently released app.  The company is called Dirty Dog Software and it appears it is named after their beloved black lab. I am a big dog lover myself and have a golden retriever who's name is Piper.  Piper thinks he is a human as you can see by the photo.


Julia and her friends spent the last year in the Bahamas cruising and exploring the many awesome anchorages of this island chain. They have also re-wired several boats over the years and found that most wire sizing programs and apps were just not providing what they needed. Out of that need came the DC Wire Sizer app.

First I am impressed that these women love sailing and do their own boat wiring. I am also impressed that they created their own iOS app to solve a problem many of us have.  I know a lot of guys who don't know electrical wiring basics so great job ladies!  I hope that did not sound sexist.  Their DC Wire Sizer app was developed and has been used and tested extensively by industry professionals and they feel it is the best and most complete app of it's type.

DC Wire Sizer offers two unique user interfaces. The Sizer Pro for the professional and the Sizer Wizard for the occasional novice user.  The Sizer Wizard is really what makes this app so easy to use. The Wizard walks you through the process by asking five easy questions to get the correct size of wire, voltage drop percentage and ampacity of the wire. What you don't see is all the data, research, calculations and engineering behind the scenes.

If your doing a lot of wiring on your boat, the app allows you to save the calculations with project names and wire type.  The app then can sum the length of the wire runs by wire type and size which can be used as a shopping list for your projects.  No other app offers these unique features and that's what makes it a winner.

Features:
  • Two calculating interfaces to choose from, Pro and Wizard
  • Create a wire description and assign it to a project
  • Select maximum voltage drop %, bundle size and insulation rating
  • Select a fractional amp, watts or enter a fractional volt for low voltage projects
  • Sizer Pro for specific calculations
  • ABYC E-11 and European ISO 10133 standards
  • 12, 24, 36 and 72 voltage inputs with optional custom voltages up to 500 volts
  • Select Voltage Drops 1, 3 and 10% with optional custom settings
  • Wire color codes
  • Conduit, inside or outside engine room settings
  • AWG, SAE and mm2 wire sizes
  • Units in meters and feet
  • One way, round trip and duplex wire length calculations
  • Extensive HELP section
  • Email Export of calculations
  • Built in Notes and installation tips and recommended tools
User Interface:

Wire Sizer user interface is nicely laid out with options for two different displays.  Sizer Pro or the Sizer Wizard can be selected according to which option you like. Wire Runs, Raw Materials, Help and About are the remaining pages.

The other pages and features of the app can be accessed on the bottom of the screen with the soft keys. 

The main user interface can be switched using the Action Menu button on the top left of the screen. Select this to toggle between the Sizer Wizard and the Sizer Pro displays, email content, export file and settings. 

Other menu settings let you select various other parameters used in the app. There are options for North American and European standards, wire gauge selection, measuring units in English or metric and Sizer Pro wire length calculation options.

The Sizer Pro screen allows you to select all the different parameters on one screen. Selections for Voltage, Insulation, Wire size, % voltage drop, Circuit load and Length are provided.

Convenient spin dials make it easy to select the desired parameters.

As  you make selections for the various parameters the app automatically calculates the proper wire size, ampacity and voltage drop.

Projects can then be save by selecting the Save button in the top right of the screen. Saved projects are then archived for future reference and use. Various parameters can be selected and set to create a shopping list for the required materials for the project. 

The Sizer Wizard is the other user interface. It was developed to basically walk the user through the process by asking 5 easy questions to determine the proper wire size for your job.

This Wizard is so easy and intuitive to use that even the most novice do-it-your-selfer can use it.  Julia and her developers have done all the research and calculations in the background and the user is provided with proper wire size for the job every time.

Each of these calculations can also be saved with a unique description and project name from a drop down list or typed in as needed. 


The Wire Runs button is where you can view all of your saved calculations and projects. Selection filters at the top of the screen let you view All Projects, Active Projects or Completed Projects. 

This page will help you keep all your wiring project organized and let you focus on the active projects that need to get done. Old projects can be archived and saved as completed. 

Entries include Boat and project name to keep you organized.  

To change any parameters of the projects simply select the Edit button in the top right of the screen.  You can then change the parameters by tapping the > arrow on the right.


The Raw Materials button provides a handy list of all your projects and the materials needed to complete them. 

This screen allows you to sort your project by All, Buy and Inventory.  This filtering lets you to see all projects, projects that you can do with wire you have on hand and projects that you need to purchase materials for.

The DC Wire Sizer app has taken the extra step to provide these added features. I like the idea of just taking my iPhone the store and having a list of materials already made up for me.

Lastly, the Help button provides a vast list of explanations for all the features of the app.  Additional resources, tips and technical notes are provided for the person who want to learn more about the calculations being made and the theory behind it.

My finals thoughts are that I find the app to be very accurate and easy to use.  It will definitely be on my iPhone and iPad.  I have done a lot of wiring projects in the past and always had to refer to table, books and diagrams to make sure I was getting it all correct.  DC Wire Sizer had taken all of the guess work out of designing a safe and effective electrical circuit with the proper wire size.

~~~ Sail On ~~~ /)
Mark

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Learning on Accessibility for the iOS Platform

Posted by Unknown Rabu, 10 Juli 2013 0 komentar
According to Apple's Accessibility Guide for iOS, you should make your iPhone application accessible to VoiceOver users because:
  • It increases your user base. You've worked hard to create a great application; don’t miss the opportunity to make it available to even more users.
  • It allows people to use your application without seeing the screen. Users with visual impairments can use your application with the help of VoiceOver.
  • It helps you address accessibility guidelines. Various governing bodies create guidelines for accessibility and making your iPhone application accessible to VoiceOver users can help you meet them.
  • It's the right thing to do.
As of iOS 3.0, Apple has included the UI Accessibility programming interface, which is a lightweight API that helps an application provide all the information VoiceOver needs to describe the user interface and help visually impaired people use the application.
I had recently given a presentation on my Learnings on Accessibility for the iOS Platform at an internal event at Intuit, which I wanted to share with all of you.  It provides an overview on what it means to make an app accessible for the iOS platform. It also provides guidelines for making your iOS app accessible and includes an overview on the most common accessible attributes, traits and how to add Accessibility via interface builder as well as in code. It covers Accessibility Notifications, VoiceOver specific API, Accessibility Containers, and some of the best practices for Accessibility.
 
If you find the presentation helpful in making your iOS app accessible, feel free to send me a comment!  
Enjoy making your iOS app accessible!

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Nobeltec Time Zero for iPad

Posted by Unknown Sabtu, 29 Juni 2013 0 komentar

Application:  iPad2, New iPad iOS 6.0 or later
Function: Marine Navigation and charting
Rating:****
Cost: Free, charts $39 to $49

NOBELTEC is a well known marine supplier of PC based charting software, hardware and marine charts. Their new app, Time Zero is their latest addition to a long line of successful products.  The same app is also marketed under the MaxSea Time Zero name. The only difference is that the MaxSea version can be provided in French.

The app was developed and targeted towards small boats who do mainly coastal cruising.  At first glance it has some of the basics but lacks the horse power to do some advanced features at this time. The app is free to download and comes with a demo chart for the Miami area. Charts can be purchased for $39 to $49 depending on what set you need. Coverage includes NOAA USA, Canada, Caribbean, Mediterranean West, Central and East, English Channel, United Kingdom and Western Europe.

Features:
  • NOAA Raster Charts
  • Range and Bearing Measuring feature
  • Satellite view
  • Tide height and currents
  • Track up or course up
  • Routes including customizable color and thickness with centering and XTE
  • Tracking including customizable track color and thickness
  • Redo/Undo
  • Customizable plotter display transparencies
  • Customizable units English or metric
  • Customizable boat length and icon size
  • Local Weather
  • COG
  • SOG
  • Course to Steer
  • Next Course
  • Time to Go
  • Distance to Waypoint
  • Cross Track Error
  • Velocity Made Good
  • Estimated Time of Arrival
  • Time to Arrival
  • Distance to Arrival
  • Pan, Zoom
  • Standard or 3D display
  • Customizable data display 
User Interface:

The user interface in made up of a chart display with many icons, tool bars, drop down menus and layers. 

There are a variety of ways to access the settings which are spread over several screens.  The user interface was a little confusing at times. I could not remember which Nav Bar or layer to view to turn on or off certain features. I suppose if I used it everyday I might remember where everything was. It would have been nice if the designers chose just one way to access all the data and settings.

Chart Slide Bar is located on the right side of the screen. It allows you to  zoom in and out on the charts.  You can do this with the slide bar or by tapping the + and - sign.

The Tool Bar runs across the top of the screen. This contains Do/Undo buttons, Track on/off and Route buttons, Ruler feature, Order and Manage charts and open Facebook. I like this tool bar and wish the author would have put all the settings and selections in this one location.

A Center Vessel Button is located on the top right side of the Tool Bar. Selecting this bring the vessel to the center of the chart.

The NavData section, on the left side of the screen, is where all navigation data is displayed.  This is by far the best feature of the app. It displays all the navigation data in either digital or analog displays.  Select the + icon on the top to add or delete displayed items. At the bottom of the box is a 3D feature which can be toggled to display the charts in a 3D perspective. To the right of that is the North up or Track up button.

The display can be minimized by tapping the down arrow on the top center of the NavData display.

On the top left side of the display is the NOBELTEC category menu. These are in fact settings for the the Ship and Track, Routes, Marks, Plotter, Units, General and About info.

Ship & Track settings let you customize the ship predictor vectors and recorded track color and thickness. 

Routes settings include color, thickness, Auto zoom, waypoint switching, switching radius and cross track error vales.

Marks  has settings for the appearance, color an size of the marks. 

Plotter options lets you configure the display settings.  Settings are available to show or hide the chart slide scalar bar. Transparencies for the NavData, Photo fusion and tides can also be set. The 3D tilt angle can also be customized here. 

The Units page lets you set the English or Metric unit for the display of data in the app. Data includes GPS position, Range, depth, height, Temperature, Boat speed, Wind speed, and Atmospheric pressure, 

The General options include boat length, boat icon size, demo mode, start up tips and disabling sleep mode. 

The About section includes App Usage Tips, License, Data usage and Chart memory. 


The Layer Tab can be accessed in the bottom right of the screen.

Simply swipe up to access setting for Satellite photo, Tide currents and heights, Tracks, Routes and Marks.

Select Satellite photo and 3D to give yourself a unique perspective of the coastal areas with the charts.

Charts:

Time Zero only supports the NOAA Raster charts. I am a big fan of Vector charts so this was somewhat of a let down. They have chosen to provide the app for free and charge for the charts.  With the purchase of charts expect to have about $39 to $49 invested for a working app with charts.  This is on par with some other premium charting apps.

Chart coverage is of the US, Canada, Caribbean, Mediterranean, English Channel, UK and Western Europe.  Chart coverage is far from world wide so make sure these cover your area before purchasing the charts.

One thing I did not like was that it does not support vector charts.  Hopefully they make these available in the future. Prices for the raster charts seemed high at $39-$49 compared to other apps that offer them for free.

It has some cool features like 3D, satellite maps overlays, tides and a little weather box.  It is missing several key features including Points of Interest, AIS, NMEA instrument data, GRIB weather data, Weather Radar, Routes and Tracks Import/Export.  This of course is version one so I can only hope we will see some of these additional features in the future.

Waypoints and Routes

Time Zero switches things up a bit by calling their waypoints, Marks. I wish they would have stayed with standard navigation terms.

You can create a Mark by tapping the screen anywhere on the chart. A pop up box will display showing the latitude and longitude with selections for Mark, GoTo, New Route and Move Boat.

If you select Mark it will create a marker(waypoint) on the screen. You can easily move these by tapping and holding your finger on the Mark or selecting the Move option. It will then highlight and allow you to drag it to a new position. Taping the Mark with your finger will display a pop up box showing location, range and bearing from your current location, SOG and time to the destination.

Creating Routes is done easily by tapping the screen and selecting the New Route selection. Continue tapping points on the screen to create your route marks or waypoints.  To activate a Route simply select the point in a Route and select Activate or select the Route Boat icon in the top middle icon menu. To deactivate a Route deselect the Route Boat icon in the top menu or select the route and select Stop Nav.

Time Zero has made it easy to visually keep track of all your Routes.  There is no list of Routes or Waypoints in the app. All marks and routes are displayed on the charts. Deactivated routes are shown with a Blue Ships Wheel with an arrow. Simply tap this icon to expand the Route to show the marks in the route. If you create a lot of Routes and Marks the chart might become pretty congested with icons.

Tracking

A Real time track of your position is captured if you select the Track icon in the top center menu. It is the boat with a red arrow on it. I will continue to record your track until it is toggled off. I was not able to find a setting to view or delete tracks.

Winner or Loser?

Time Zero has a winner with it's introduction to the iPad marine navigation app market.  It has some cool feature like the NavData display and 3D satellite views but it falls short in a few areas.  When I compare it to apps in a similar price range I was expecting a few more bells and whistles.  It does not have NMEA data, AIS, GRIB files, weather radar, vector charts, night mode, Points of Interests or import/export capabilities.

It is only their first release so I look forward to many of the feature being added in the future releases. 

If your a basic coastal cruiser this app will be a great addition to your Marine navigation tool box.

~~~ Sail On ~~~ /)

Mark 

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Navionics Advance Map Options

Posted by Unknown Minggu, 09 Juni 2013 0 komentar
Navionics has added some new features to enhance the performance and functionality of their charting apps. Back in September of 2012 I wrote about the new Nav Module features. This added additional routing information including estimated time to destination, distance to waypoint, course heading, time to next waypoint, and fuel consumption.

The Advanced Map Options is one of the more recent additions.  An Auto Routing feature had been introduced with version 4.6 but was recently pulled to make some improvements. It is planned to be released again soon.

Navionics has chosen to charge for each of these additional features, unlike other apps that include a lot of these same features in the base price.

This marketing model allows users to pick and choose what additional features they want to add to their apps rather than paying for a lot of features that they may not want.

Navionics is already priced at $49.99 for the Marine and Lakes USA HD iPad version. One would expect many of these features to be included for that premium price.

The Advance Map Options let you customize how you view the map data. To add the advanced map options or other upgrades, select the Menu/Upgrade & Apps. This upgrade and others will cost you $4.99.

Features:
  • Highlight Shallow Areas
  • Select Depth shading
  • Filter Depth Contours
  • Adjust water level
  • View seabed composition
  • Toggle Fishing mode.
Some of these features are only available in select regions of the Navionics charts.

The options are selected in the Menu/Map Options panel. Buttons and sliders are used to enable and set the options.

Many of these features appear to be geared towards fishing. The fishing range option
allows you to highlight a specific depth range that you could easily follow on the chart.
As a sailor or motor boater, I am not sure if I would find them that useful.

Navionics makes it easy to select and add additional functionality to their apps. Sometimes I feel that I am getting nickel and dimed for the purchase of each feature. That is why I will probably pass on this one. The upcoming auto routing feature does look interesting and may be useful.  It is nice to have the option to only purchase the features I need.

~~~ Sal On ~~~ /)
Mark


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HF Weather Fax and Navtex Pad Marine Weather

Posted by Unknown Kamis, 30 Mei 2013 0 komentar


Application: iPad, iPhone iOS 4.3 or later
Function: High Frequency Weather Fax Data
Rating:****
Cost: $2.99

If your making long distance passages with your yacht your in need of up to date weather information.  Weather is key to timing your travels and staying safe while underway.  Weather information over the radio is not a novel thing. I listen to the radio everyday to get weather forecasts.  But getting a weather fax on my iPad over the radio, now that is almost James Bond cool! 

BlackCat Systems has a variety of apps related to HF marine radio facsimile transmissions that can be received on your yacht with the use of a HF marine radio. Many cruising yachts already have HF SSB radios and rely on them for long distance communication.

Two of their apps caught my eye. One is called HF Weather Fax and the other is Navtex Pad Weather.  The HF Weather Fax app allows you to download radio facsimile graphics to your iPad over a HF marine radio.  This can be done without a cell phone or Internet connection.  These software products have been available for laptop PCs for a while and are now available for your iPad or Android mobile devices too. The Navtex Pad app, shown at left, downloads the marine weather forecast for specific areas.

The HF Weather Fax app also has a built in copy of the NOAA/NWS Radio facsimile schedule along with an option to download the latest copy of the schedule from the NWS website.  This will keep you up to date on the broadcast areas and schedules.

NOAA or the National Oceanic and Atmospheric Administration broadcasts weather fax and forecast data from a variety of locations around the world.  Most of these can be picked up with your SSB radio on board your boat.  Other lower cost portable weather radio options are available too.

Coverage includes broadcast stations in South Africa, Asia, South America, North America, Pan Oceanic Basin and Europe.

How It Works:

Once you open the app it automatically starts trying to decode whatever it is hearing through the audio input or microphone.  The menu at the top includes  selections for Tune, Schedule, Stop, Auto, Save and View Saved.

If you are not ready to decode a fax signal hit the Stop/Start button. The Tune button brings up a display showing you the signal strength of the audio.

The Schedules page is a document from the NOAA/National Weather Service that list the broadcast locations and stations around the world. The broadcast site list their call sign, frequencies, times and power. Schedules are include for each site and the contents of their transmissions. Many include surface analysis, air prognosis, weather bulletins, GOES satellite view, tropical cyclone maps, 24, 36 and 48 hour surface pressures and coastal wave analysis.  Several other products are available depending on which station you connect to.

Tapping the Auto button will change the Auto save mode on and off. When set to Auto, the stop tone of a fax will be used to save the received image.

The Save button can be tapped to manually save an image at any time.

The Download Latest button downloads the newest broadcast schedule to your device. You will need to be connected to the Internet or have a cell connection to download the new schedule.  You can also tap on Default Schedule to erase any downloaded copy, and revert back to the default copy that was provided with the app.

The FAQ section has a lot of good pointers on how to get the app to work the best.

Back on the main page there are buttons to Save and View Saved images.  Tapping on the Save button will archive the current image to the saved directory.  The View Saved button will bring up a list of the saved images. Tap the name of the image and it will be displayed. The option to delete stored images can be done at this time. 

Tips and Tricks:
 
The app picks up the audio from radio fax data broadcast by NOAA and coverts it into images and forecast data.

The app requires that you feed the audio output from your SSB or HF Weather radio into the iPhone or iPad.  There are several ways to accomplish this.

The easiest way is to just set you iPad near the speaker of the radio. This works but any background noise will interferer with the the audio and may cause poor reproduction of the fax data.

You can plug a set of headphone or ear buds into the mic of your iPad and then place these next to the speak of the radio.  This cuts down on some of the back ground noise and works rather well.

Direct connection of into the microphone jack of the iPad is the best way to go. This eliminates all of the back ground noise and produces the best data.  The iPad USB Camera Connection Kit accessory will allow a USB cable to be plugged directly into the iPad.  This is the best solution for eliminating all background noise.

If you don't have an SSB radio other lower cost weather radios will work. Take a look at the authors listing of radios to use with your app and some suggestions on how to choose a radio.

The weather fax frequencies are published in the app.  For best results make sure to tune about 1.9 kHz lower in frequency than the listed carrier frequency.

Your first transmission may seem slightly slanted due to the timing delays between the devices.  This timing can be corrected by adjusting the delay settings which are located at the top of the screen.

The default delay value is zero. If the received image is slanting to the right, the timing adjustment must be increased by pressing the + button. If the received image is slanting to the left, the timing adjustment can be decreased by pressing the - button. Once set the timing adjustment values will be automatically saved and used each time you run the app. 

I really like this app. It does what it is made to do and does it well.  For $2.99 it is a great way to receive valuable weather data at a fraction of the cost of a dedicated weather fax. You don't need a $1000 dollar SSB to receive the signals.  A low cost HF weather radio will work just fine too.

If you sail offshore, an app like this can provide you with much needed weather information to make
a safe passage.  Having another source of weather data can help you make better routing decisions and verify any other forecast you may have.

~~~ Sail On ~~~ /)
Mark






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Google I/O 2013: An In-Depth Developer's Perspective

Posted by Unknown Sabtu, 18 Mei 2013 0 komentar

In comparison to last year's Google I/O featuring the spectacle augmented reality Google Glass  announcement via a breathtaking sky-diving presentation, this year's Google I/O may have seemed to lack luster with no new hardware.

Nonetheless, Google I/O kicked off a record 3.5 hours Keynote with a heavy focus on software and services. The Google I/O Keynote discussed services and feature upgrades for both Android and Chrome. If you were expecting a brand new Android phone or tablet announcement, then you may have been disappointed. However, a major takeaway was a unified user experience for Chrome and Android platforms through shared services.

According to Google, Android was at 100 million activations in 2011. And, it was at 400 million in 2012.  And now in 2013, Google released the numbers for the Android activations at an incredible 900 million!   Now that's no small feat...

A huge applause from the audience came when Google mentioned the introduction of Android Studio IDE based on IntelliJ!  The Android Studio IDE tool has more options for Android development making the process faster and more productive. A live layout was shown that renders your app while you are editing it in realtime. It allows you to see a variety of device layouts (i.e. different form factor phone devices and tablets). Refer to TechCrunch's excellent review on Google Launches Android Studio and New Features for Developer Console Including Beta Releases and Staged Layouts for further details.

There were several other significant announcements made at Google I/O including:

  • Google Maps gets a complete overhaul and is released as part of Google Play Services.  Three new Location APIs introduced include:
    • Fused Location Provider API utilizes all of the communications sensors in the phone including WiFi, GPS and Cell network while significantly saving battery life. This is a new service that greatly improves any application that uses location services.
    • Geofencing API allows apps to inform the user entering or exiting a configured virtual fence. The API allows each app to define up to 100 geofences simultaneously. Apps utilizing this service will provide better battery life and performance.
    • Activity Recognition API utilizes the device capabilities of the hardware and machine learning to determine whether the user is walking, cycling or driving. This allows apps utilizing the service to adjust their behavior depending on the user's mode of transport. It is done in a very battery efficient way as no GPS is required.
  • Google+ Single Sign-in API is a cross-platform Sign-in API.  Fancy was used to demo during the Keynote that if you find a cool website that you like, you can sign-in with Google+ and then you will automatically be asked if you would like to install it. If you indicate yes, the the app will download and log you in automatically on your current device and other Android devices on your account - now that's very cool!
  • Google Cloud Messaging (GCM) for Android gets an overhaul. GCM is a service that allows you to send data from your server to your users' Android-powered device, and also to receive messages from devices on the same connection. The new features to GCM include:
    • Faster, easier GCM setup
    • Upstream messaging over XMPP. GCM's Cloud Connection Service (CCS) lets you communicate with Android devices over a persistent XMPP connection. The primary advantage of CCS are speed and the ability to receive upstream messages (i.e. messages from a device to the Cloud).
    • New API for Synchronizing Notifications. Maps a single user to a notification key, which you can then use to send a single message to multiple devices owned by the user.
  • Google Play Music All Access was launched in the US at I/O. It allows you to buy a music subscription from Google and costs $9.99/month and comes with a 30 day free trial. It allows you to explore millions of music tracks so it seems great for music discovery than its competitors (i.e. Spotify, Pandora). It is a simpler on-demand-meets-radio service with various personalization features, and works on phones, tablets and web browsers. From a design and UX perspective, it makes it easy to switch between the hands-on and hands-off experiences. If you are not sure of what you want to listen, you can just hit "Listen Now" and start listening to something right away. And, when you want to search on Google's huge on-demand catalog, you have that option as well.
  • Google Search. Google I/O 2013 marked the "end of search as we know it". Google announced that it is looking to change the way users go about finding information by expanding its voice search capabilities and through its various services such as Google's Knowledge Graph and Google Now with a credo the company has labeled "answer", "converse" and "anticipate". In other words, the company's core product will eventually respond better to naturally phrased questions. Anticipate means that Google Search will be able to guess what information users need the most and provide it for them easily via its Google Now service. The Google Now service pulls information from across Google services to act as a personal assistant of sorts by offering information on users' commutes, appointments and news from their favorite sources in the same place. Conversational Search was announced to be coming to all desktops and laptops via Chrome.
  • Chrome. Google announced that today there are 750+ Million active users of Chrome and that Chrome is increasingly used on mobile. Chrome design goals are: speed, simplicity and security. Google's Sundar Pichai said, "The same capabilities that you're used to using for Chrome on a desktop are going to be coming to Chrome on Android." Thanks to WebGL and Web Audio APIs, you will start seeing quite impressive web experiences including games and rich interactive environments that were typically limited to the desktop environment.
    • Better Web Imaging. Google compared JPEG vs WebP images. The quality of the image was indistinguishable, but it was about two-thirds in size (i.e. 31% reduction in file size). This will significantly improve the load times on websites as well as help users to not exceed their data plan limitations. Furthermore, WebP supports animated images as well.
    • Better Video compression.  Google compared H.264 vs VP9. It was noted that the quality of the VP9 video is the same as H.264. However, the size of VP9 comes in at less than half the size (i.e. 63% reduction in file size).
  • mCommerce. Google reported that when it comes to shopping on your phone, the percentage of people that come to the purchase screen and then get out from there is incredibly high in the 90%. Google made 3 key announcements around mCommerce:
    • Consumer launch for pay by Gmail which is rolling out slowly with initial rollout in US
    • Two new APIs announced for developer launch:
      • Google Wallet Object APIs. The vision is to digitize whole Wallet by allowing insertion of any kind of Objects into Google Wallet
      • Google Wallet Instant Buy for merchants selling physical goods. The goal is to allow consumers to make purchases within 2 clicks thereby improving the user experience.
  • Google+  Google introduced 41 new Google+ features at I/O!  First of all, Google+ gets an overhaul on its design. It is a multi-column design where its width will scale depending on the device that the user is on. It includes animations, flip and fade. It can do image analysis, recognize the image and hashtag it automatically.
  • Google Hangouts is now a standalone app that will work on the web desktop, Android and iOS all announced starting at I/O. This will provide an on-going conversation within the hangout and doesn't end when you sign off. Also, RealTime Communication, that is, group video is available at no charge.
  • Google Photos: Google announced earlier that in addition to unlimited backup of all of your standard sized photos, it will now give you 15 GB of storage for full-sized images. Google also announced machine learning algorithms that help to create a highlight reel for all your photos. The service will check all your photos in the album for blurriness, smiles and several other criteria (learnt by hundreds of actual human photographers, and produces a highlight reel.) Google also introduced an "auto-enhance" feature that will instantly adjust tonal distribution, red-eye reduction, skin softening, noise reduction and several other criteria to automatically enhance the picture. And, finally, Google introduced a new "Auto Awesome" mode. That is, if you take a burst of photos, it will make an animated gif out of them. If you take a series of screenshots, and if some are dark or if someone is smiling in one, but not the other, it can make a composite image similar to what the Galaxy S4 can do without the user having to activate that setting. And, that sounds cool!  It can also handle screenshots in "Motion", HDR, and panoramic photos.
And, no developer review would be complete without the mention of the Developer Sandbox, which occupied 2 floors, with dedicated ones for Android, Wallet, Chrome, standalone ChromeBook Pixel display, Google+, Photos and Google Play. And, not to forget Google Glass had an extra large sandbox which was often crowded with spectators!  Google started shipping an early version of Google Glass known as Explorer mostly to a couple of thousand developers who had requested them at last year's Google I/O conference - forked over a hefty price of $1500!  
I was fortunate to explore Google Glass and the experience was truly amazing! Glass is not like wearing a laptop on your face, though it does have a 12 GB of usable storage (16 GB total), synced with Google Cloud. Glass is more like augmented reality spectacles, but without lenses. Its lightweight frame rests on the ears and nose, suspending a small prism at the upper right corner of the wearer's field of vision. Glass has a tiny touch pad built into one earpiece and a microphone to pick up voice commands. Interestingly, the earpiece uses "bone conduction" to deliver sounds by vibration against the wearer's head. You can speak aloud to get information  or tell Glass to "take a picture" or "take a video" (up to 10s  snippets). You can ask questions like "Google find me a restaurant" and see the results in "Knowledge cards".You can also send texts and make phone calls. If you swipe toward the back, you can see Google Now cards for flight, traffic and other information.  In summary, Google I/O 2013 showcased several interesting innovations across Google products.

If you found this article useful or want to share your developer perspectives on Google I/O 2013, feel free to share your comments below, follow me by clicking on the upper left hand corner and/or follow me on Twitter @tasneemsayeed.

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