Re: Easy solution
My vehicle already uses wheel rotations and steering wheel angles to work out where it is along with the GPS signal. It increases the accuracy of the system to the point where I found I could drive (albeit it incredibly slowly) using the turn countdown indicator at night in a sudden fog so thick that you could only see a car length ahead. It was enough to get me onto a side road where I knew I could find a space to park up until the fog thinned a bit a couple of hours later.