I use my iPhone to play my iTunes collection through the voyager stereo. I use the Kawasaki adapter and it works just fine. In fact, that is one of the reasons I went with the iPhone. When you connect your iphone to the adapter and then select "aux" on the bike stereo, the itunes collection is automatically queued. I have not tried to see if I can listen to pandora. That might require some kind of Bluetooth connection (?) since it is coming through the phone (vs being stored on the phone). I don't know about hearing a GPS either. I hope this helps somewhat.
2009 Vulcan Voyager, Wolo Bad Boy air horn, Kuryakyn ISO grips with contoured throttle boss, Kuryakyn Adjustable Floorboard Cruise Peg mounts with pegs, Cobra Tri-Oval exhaust, K&N air filter, temperature dipstick, saddlebag rails, Superbright trunk light flasher.