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Re: Accuracy of GPS with respect to surveys

    The actual number for position accuracy available to civilian population
is 15 meters. The 100 meter value is based on US DOD imposed Selective
Availability Program. Using an 8 channel serial receiver usually results in
a position error of 90 to 140 feet, (personal experience). This appears to
depend on the number of SATs locked onto. I suspect use of a 12 channel
parallel receiver would produce better accuracy. Use of the signal from a
digital GPS receiver and a GPS unit is said to be 5 to 10 meters.

George Andrews