>In a car it is even easier. The car nav system KNOWS it must be on a >roadway. The car's ground track (positional history) must be on a road.
That's assuming the GPS company keeps their maps up to date (it doesn't matter how often you update the maps in the device if the company's maps don't keep up with reality). New roads appear, old ones occasionally get moved. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
