On Thu, 25 Mar 2010, Erik Lundin wrote: > Talking about tunnel tracking... > > I have thought of a solution were you have a GPS device together with an > electronic compass sensor. In the tunnel, the position is calculated by > knowing the last position, the speed (either from the speedometer in a > car or keeping the same speed as before the tunnel) and the compass > direction. Since the error in this case increases exponentially with > time (right?), it would help to drive through the tunnel in both > directions. > That was my son's method, to do the track from both ends. Yes the errors increase exponentially with time from each time you zero the device. The error was still huge.
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