SPOT Connect
The SPOT Connect is a GlobalStar satellite beacon for use by hikers and sailors that sends short text messages and GPS coordinates from a smartphone with Bluetooth. I've begun poking around it, after seeing Alexei Karpenko's excellent article on the original SPOT.

At present, I have custom Bluetooth clients in Python and QT Mobility. I've also managed to sniff the L-Band transmissions, which are unencrypted.
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