Along with the gps app I wrote there is a tiny little program (hack_init) that succesfully hacks the init binary to start a wrapper instead of the real player app. It adds the -s- flag to the arguments when it notices that the player is booted in the car. It works for me, otherwise I wouldn't have been able to
get the GPS output in the first place.
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40GB - serial #40104051 gpsapp