I have began looking into Automatic Position Reporting System which uses a GPS unit in conjunction with a two-way (amateur) radio to transmit your location to a remote station.
To make all of it work, you have to have a radio and a TNC in addition to the GPS unit. This project:
Byonics - Pocket Tracker has combined a TNC (well, sorta) with a radio (again, sorta). There are two things that makes it interesting are a) it's low cost and b) it fits into an "Altoids" mint tin.
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