I’m beginning to think it’s the CarPlay/vehicle GPS interface (or lack thereof) that is the problem. Did a successful run into town using directions, which seem to provide “rails” for the GPS (it knows you are probably near the path). Coming home, I just used the “freestyle” map (no directions; just location on the area map) and it just completely lost me. It had me in the river that flows through town for awhile. I got out of the car at home and the GPS signal rebounded to between 50 and 75%.