Ok how would i do this with an external navigation unit? like a garmin? I know you can do AUX but i want to do a dual hook up. I would like the navi sound to kick in only when it say something while im listening to like the radio/cds. Like the navi sound override the radio and then goes back to the radio when the navi is done talking. is this even possible? I know that the new civic navigation has this and thought it was pretty cool.

 

can be done, but you'll have to DIY

what headunit are you running?

 

Does your head unit have nay sort of audio interrupt?

 

My Garmin (765T) can be used as a media player as well, and can be connected either directly or via a radio link up to a head unit. I believe the music can be interrupted for the instructions. Good for occasional use but admittedly not something I'd want to use all the time.