APRS-Go

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APRS-Go is an APRS(tm) application for Windows Mobile that uses OpenStreetMap (OSM) map tiles to create a continous "slippy-map".  APRS-Go uses maps cached on your PDA, unconnected to the Internet.  A desktop application, OSM for APRS-Go, is available to create map projects, which you copy to a storage card for use by APRS-Go.  You do not need to calibrate OSM maps. 

Version 2 of APRS-Go for Windows desktop has been released.  This version adds bing(tm) query capability to APRS-Go.  I believe bing query is a first for APRS, and perhaps for packet radio.  A properly formatted APRS message sent to an APRS-Go station, from any other APRS station, will cause APRS-Go to perform an internet search and return information back to messaging station.  More specifically, the message sent to APRS-Go is a request for the phone numbers, locations and names of any business or person in the Yellow Pages and White Pages.  The Microsoft bing(tm)  phone book database contains the latitude and longitude of each of these entities, and APRS-Go will return these as object packets when requested.   I invite you to try this new version.  To use it, you must have a non-dial-up internet connection on your PC.  Once APRS-Go is installed on your PC, any APRS station that sees you can send your station a "bing query" in an APRS message.  Instructions are located at APRS-Go bing query.

As of June 25, 2010 a Windows desktop version of APRS-Go is available in the aprsgofiles directory.  The desktop application is called APRSGo Desktop v2.0 and is available in an msi file.  It also uses OSM map projects.  To install this application, download the setup.exe and the APRS-Go Desktop.msi files, and double click on the setup.exe file.  Installation is much easier than PDA installation. 

The desktop version is similar to the PDA version, but it is somewhat easier to use.  Please refer to the APRS-Go Mobile Quick Start documentation.  I think the differences will be obvious to the user.

There are several map services on-line that are potential sources of maps for products such as APRS-Go, but OpenStreetMap is the only service (that I am aware of) which allows unrestricted download and caching of it's map products.

Additional features of APRS-Go include:

  • sending and receiving APRS messages, bulletins and status, 
  • logging received packets,
  • continuous map display of your position,
  • pop-up window of detailed packet data when tapping station icon on map,
  • supports standard TNC and KISS protocols,
  • and much more.

APRS-Go also supports maps from standard image files (e.g., bitmap, JPG, .PNG).  Use the Calibration screen to enter two map points (pixel positions and corresponding latitude and longitude) and you have a map you can use for APRS. 

APRS-Go works with Windows Mobile versions 2003, 5.x and 6.x. 

You may download the User Manual and CAB files at the aprsgofiles link.  If sufficient interest exists, I will continue to add new features.

Please, questions, report bugs, or send requests to join the APRS-Go users' group, to AA3NJ at aprsgorequest@aol.com.   

APRS is a registered trademark of Bob Bruninga, WB4APR.

 

The main APRS-Go screen lists all stations heard.  The screen displays  callsign,  APRS icon, and count of packets received. 

"Radio Buttons" let the user select how data will be displayed in the Data Grid  and on the map.  You can select to view all stations, or only stations that you have checked.  You may also select to view  the latest received data, or all historical packets from the selected stations.   When selecting to view historical data,  the map will display the tracks of moving stations. The "Uncheck All" button is a convienient way of de-selecting stations.

The "Wx" check box at the bottom right of the screen causes all weather stations to be checked.  There are special map viewing features available when this box is checked.

 

 

 

 

 

Pressing the View Grid button displays a spreadsheet style view of APRS data,  showing latitude, longitude, message time, comments and packet path.

The buttons at the bottom of the screen rotate the display between portrait and landscape.

 

 

 

 

Pressing the View Map button displays the Map page.  You select a map via the "Maps" menu.  Stations are added to the map display and to the main page list as they are received.  In the "Last Heard" mode, station positions are updated as new positions are received.  In the "History" mode, a station's new position is added and connected to its prior position by a line.

 

 

The image below depicts the "History" mode for a moving station. 

Selecting "Details On" from the "Maps" menu displays a grid cell for each available detailed map. 

Pressing the desired grid cell displays the selected detail map, and adjacent detail maps. 

The "Wx" box on the main page enables display of weather stations only.  Weather display options are available under the "Labels" menu.  (These examples were made using a 320x240 screen emulator.  Maps appear much clearer on a higher density PDA screen.)

This screen shot shows the temperatures reported at each station.  Display of rain accumulation, barometric pressure, snow accumulation and wind speed are also available.

 

Only two points on the map are required for calibration.  The example on this site uses a 900 x 900 pixel map of the Washington, DC and Baltimore area exported from Street Atlas USA 2008.

 

The Paint application available within Windows was used to crop the exported map and to identify the X and Y coordinates used to calibrate the map.  The latitude and longitude of the selected points were identified from Street Atlas.  These are entered in degrees.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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