Having tried VZW Nav on the Storm and Google Nav on the Pre (along with the factory installed system on one of our cars), Google Nav on the Droid is unparalled (sell your stock in stand-alone GPS makers). VZW Nav on the Storm is clunky (and costly). Google Nav on Pre is free, but the speaker on the Pre is pretty much useless. Speaker on Droid is exceptional (but synthesixed voice needs more options). HOWEVER, unless you shut down the Nav app, it will continue to give you updates even when the phone is set to Silent. Learned this the hard way last night at a solo guitar concert, when midway thru a song my phone announced, "You are 600 feet from your destination." I've since downloaded the TasKiller app.