I drive down the coast of Central California often. One loses 3G quite readily and I have noticed that my maps go haywire - sometimes the car spins on the Nav screen. I know that 3G was required for map updating, but I have the Tech pkg - I was under the impression that Maps were loaded onto the hard drive. I mean, didn't we recently get a Map update download? GPS should be good there - it always was in my other cars. Just can't access map refreshing.