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how to integrate a dash monut GPS with car stock FM radio and speaker system?

I like to use my car speakers  with my dash mount GPS. Is there anyway GPS announcements can be made thru the speaker system while the radio is on playing  either by fading the music or by temporarily interrupting it.. The GPS has a headphone jack output and a USB port and it is bluetooth enabled. I am thinking that a sound activated FM transmitter with an integrated  sound activated switch might do the trick. Any suggestions or solutions?

Sandisk1duo7 years ago
if you amplified the signal that comes out of your gps, you can get it to trigger a relay, so that it would switch the input form music to GPS