I have a jna 62bt jensen in my car. how do i activate the gps? nothing happens when i press the gps button

SOURCE: jensen vm9410 wont power up

easiest thing first. check the fuse on the hot wire on the radio harness. next, check to ensure the hot wire is to battery power, and the acc (likely yellow or orange) is attached to a wire that turns on with the ignition. next, check to ensure good ground. all this should take less than 10 minutes.

SOURCE: Jensen GPS NVX430BT How do I activate the text to speech ?

I'm about to return my Jensen NVX430BT because apparently the maps cannot be updated! The maps installed on the unit I just received are obviously outdated and there is no support from Jensen to get them updated. Too bad, this thing has it all except good directions.