I think that the programers at the GPS companies use Google maps overlaid with the roads indicated, we have found hundreds of streets and roads on Google that simply are wrong or non existing, one example out in the desert Google shows a road in a wash, it actually is a flash flood channel and varies in with from 40 feet to a narrow vertical side channel about 4 feet wide, the floor goes from sand with small rocks and pebbles to areas that are very fine sand and is hard for a person to walk on, if not check the road that goes down Mt. Lemon in Arizona from the fire station at the top of the mountain down to Oracle, today it is closed because to many folks using GPS tried to go down to Oracle and got in trouble and had to be rescued and that was with cars and 4x4s going down and going up the steep hair pin turns discouraged most from continuing.
navegator