A couple of times now I've had this problem on my Hero, and today it was a huge pain in the ass, as I was looking for the place I was headed to but couldn't find it. The problem is my Google Maps couldn't lock onto my signal - it was jumping all over the state - at first told me I was in Sacramento (one of the turn directions next to it had a misspelling "Socramento", wtf?), then Santa Rosa, then as I kept driving and pressing My Location, it switched to a random street about a mile away, then dumped me in the ocean :-/ During this time, the GPS icon kept blinking and didn't stay solid. Also, once it picked up a location, it didn't continue to update it as it should do. I had to restart the phone and I think it's working OK now but this is at least the 2nd time it's happened to me. Anyone else? Who do you think is to blame? I updated PRL to see if it helps for now.