It's working and this is the work around.
The USB car outlet will automatically detects, if the connected device have a compatible audio file (mp3, etc.). If it's present, it will automatically play and if it's not, it will shut off.
So, here's the solution.
Copy your favorite MP3 song to your GPS extended card then connect your device to your USB car power supply.
Tested on my Garmin etrex Vista HCX with 2GB kingston Micro SD connected on Hyundai Tucson 2011 USB Car Power supply.
Disclaimer: I'm not responsible even this site if something will happen on your device. Do it at on your own risk.
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