Garmin® Brings Turn-by-Turn Navigation to iPhone with New StreetPilot App | Business Wire
This will go good on my Verizon iPhone
This will go good on my Verizon iPhone
My MotionX has been perfect for me when i need it...and you have to assume that given Garmin's huge name in the navi world, they're going to make you pay for that name with an app.
EDGE can do voice and data at the same time.
In the case of Motion X GPS if you lose coverage while using it you lose the maps as last I saw it was using Google Maps.
With Tomtom, Navigon, several others, and likely Garmin the maps are on board like a standard GPS unit so cell coverage doesn't matter. Hence why they are normally over 1GB in size.