So I have now done 3 runs with the 4.3 version of GPS (2.9 to 4.3, huh?), and the traces seem to be noticeably better. I am just using plain GPS. It took a little longer to lock in the first time (a very bright sunny day), but wasn't a problem the next two runs. Just wondering if others are seeing improvement. It is the first time I have been optimistic about the GPS in a while.