I think that's just legal-speak to cover their asses. The cig lighter does work as a power source. It might be that the plug for your GPS isn't making good contact in the socket.
There's 3 total power points on a Screw. 1 to the right of the radio, 1 in the flow thru console (if you have it) and 1 behind the flow thru for rear passengers. The cig lighter would make 4 if you count it.
edit: All electrical systems remain active for 20 mins after the engine is turned off and key out or until a door is opened. I'm not sure if the power outlets are still active after that.
Last edited by BobbyC; 05-16-2012 at 11:53 AM.