Millions - maybe 10s, maybe 100s of millions - people rely on their phones' GPSes every day. I expect there are far more phone GPSes around than car, truck, boat, hike, and bike GPSes combined. My bet is that phone GPSes are what most people think of when they read or hear 'GPS'. And here you are dissing phone GPSes on one hand and arguing that GPSes are more accurate than sensors on the other. That's a contradiction that I really didn't expect.

You can have the last word.

I really hate over-generalizations.