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TrackReader/Android is a simple application which allows a user to connect to tracking modules such as the QStar 1000 or the venerable G-Ray. The application allows the user to connect to, configure, and download tracks from the GPS modules.
Protocol reference: QStar GPS Tracker
A job site is using QStart (or perhaps G-Ray) tracker devices attached to the various machine. At the end of each day, or perhaps a couple of times a day, a site supervisor needs to download the tracks from the trackers for analysis. The supervisor will use an Android device to sequentially connect, via Bluetooth, to each tracker, download the tracks and then move on to the next tracker.
Thingees (MJA needs to rewrite this to be more story like).