Computer driving is more about vision systems than GPS. Maps certainly aren't accurate into the centimeter range in any event. Sailors find that their charts a

Computer driving is more about vision systems than GPS. Maps certainly aren't accurate into the centimeter range in any event. Sailors find that their charts are some times off by kilometers. I've personally seen a large, erroneous discontinuity in the western coast of St. Lucia while using a GPS chart plotter for navigation. Chart data is copied forward from older charts, many of which were made in the 1800s, those guys were good with a sextant, chronometer, and a pen, but when near land you need your eyeballs.