Avoid this version like the plague. I'd logged over 12,000 miles with
versions prior to 4.0 and had zero problems. The first time out with
4.0 and it suddenly it was dropping all signals and refusing to
reacquire, following a route and suddenly telling me it can't navigate
due to no roads at my current location, deciding I'm half way around
the world, etc.
As near as I could tell, the only "improvements" are fewer voice
prompts and icons on the find menu that are harder to see.
I went back to 3.30 (most recent version I could find) and it's working
fine again.