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C00002 00002	naviga[f82,jmc]		Radio navigation for cars using fm stations
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naviga[f82,jmc]		Radio navigation for cars using fm stations

	FM stations would include in their transmissions timing
signals that would permit receivers in cars to determine the
relative phases of different fm stations.  As in Loran, this would
permit the receiver to compute the jposition of the car.
The question, of course, is whether the time of receival of the
signals is consistent enough to determine position with reasonable
accuracy.  Probably a mile isn't useful, and a tenth is very useful.
Some distortions in propagation are only space dependent and could
be calibrated out onto a map.

	Less co-operation would be required if  single station
listened to all stations and broadcast info permitting a receiver
to learn their relative phase from a fixed point which it could
use to get their relative phases from his location.