1320Fastback wrote:
Years ago in a Japan there was a GPS glitch that led cars down a boat ramp into the water.
It was not a rare occurrence as I remember.
GPS glitches are sometimes caused by the maps being a little bit off. The mapping software places the vehicle on the road even if the actual gps position is not right on the road. If it did not jump to the road one would see oneself driving on the left or right of the actual color mapped road. This jump to marked road correction can be substantial in older gps units with less sophisticated software and less accurate maps.
If a turn is almost correctly positioned on a map the vehicle will appear to make the turn correctly and stick to the line on the displayed map.
There is a road in Newfoundland that the displayed vehicle on the iPad had me driving a considerable distance away from but parallel to the road. In essence I was driving in the woods next to the road which was not the real case. I suddenly jumped back on the road as I got closer to the real road and the software decided that I must be in fact on the real road and corrected my displayed position. In some mapping programs one can turn off this jump to road position fix and see just all the funnies that are masked. I suspect that as the maps improve and position determination is more accurate that this off track effect occurs less and less.
Doug