I also got an ad with my ninja advertising GreaseNinja GPS AirAudio. It's only 12.00 and may try it with my GPS. Here's what the ad says: The Grease Ninja gps air audio system is a passive intercom system, and does not require modification to your gps device. Simply place the airaudio pick-up microphone over the gps external speaker with the supplied attachment bands, wear the adjustable fit over- the -ear bud under your helmet and you are good to go to your destination. Long story short, you can put your gps in your pocket and hear the turn instructions wirelessly through the ear buds under your helmet. I can't get hurt too bad at 12.00 and if it works it will be great. Won't need a mount.