Quote: Originally Posted by
timot_one 
I'd be surprised if the OEM navi used gyroscopes and speed sensor integration since most GPS systems use satellite triangulation to figure out all that gobbledygook.
I am only telling you what I remember my honda etm said, but I don't know for sure. I think the primary information source is gps, but secondarily I believe it uses these sensors when signal is lost.
Still, I'd think you could get more out of a car pc. But I think its up to the owner.