I use co pilot laptop 10 in the motorhome because it is good, has everything and is on the 17 inch screen in the laptop on a stand and i can see and hear everything it is telling me. It seems to be very accurate. It is designed for big motorhomes that don't make u turns or back out of blind dead ends.
Check it out,
it goes in any car too plus you can crank it up at home and plot out a trip with all the points of interest of a mile or 3000 miles.
Bebop
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BEBOP