The app is very simple to set up just needing an amateur radio callsign and the APRS passcode for that callsign (available on request from Cross Country Wireless).
Menu options include GPS position information including WGS84 locations for worldwide use and.OSGB locations for UK users. Another menu option also opens an OpenStreetMap based on the GPS fix.
The app can be used on any Android phone or tablet with GPS (and Bluetooth for use with a DigiTracker). If your Android tablet does not have GPS then the app will not work.
Note...the GPS on some Samsung phones doesn't work with this app. As a result the app is now provided free of charge for amateur radio experimentation.
There is also an option to share the APRS traffic by igating to the APRS-IS internet system using your 3G or Wi-Fi connection so that other radio amateurs can view your local traffic world wide.
The app works as a background service receiving and igating APRS traffic so that you can close the window and still use your phone as normal while it's working. Just drag down the notification view and click on Digi Tracker Android to re-open the app.
A menu option allows you to keep the screen alive until you rotate the phone or press the power button.
When you've finished with the app just click the red "STOP" button and close the windows.