There are supposed to be 2 ways to calibrate. One on intersection, the other by tires. I've tried them both. I live at a T intersection. The destination flag is dead on. So I set that as a destination as well as a separate one for my actual address. Either way when it calibrates the route and takes me home, the flag is in the right place, but the "blue" route you follow is a block farther away. Do you know where the antenna is? I just read a lengthy dissertation on another forum and you both make a lot of sense and obviously the dealer should figure this out, but they aren't. In the meantime, streets are mislabeled because I'm not there, I'm missing turns and taking others too early, the car is jumping on and off the freeway because of streets running parallel to the freeway, etc. I think that dead reckoning is overriding the GPS signals some how or its jumping back and forth because....
Because what? Can you have a damaged antenna? Dirt? ( the cars been detailed twice) Antenna misdirected? Too much smog? I don't know. Some poor guy's system showed him in the ocean. At least I'm still on land.