Here is my observation...

If there is a destination selected, the software will adjust the location of the car with the travel path even if the GPS signal is a bit mixed up. The software tries to maintain the location of the car based on the mapped streets. I had no problem going from San Diego to LA on Sunday.

Without the selected destination and weak signal, everything is pretty much messed up. Tried not to select the destination going back, and it was all screwed up.

I will take the car in to have the rear window retinted with non-metalicized tint. I was no "No charge".