Neville Michie wrote:
When you think of time specifications from GPS, the GPS system is a
poor way to find north.
Even with a base line of 1000 metres you only have a fraction of a
degree.
The GPS system may be useful to get accurate time to simplify a star
observation, from a known (GPS)
position on this planet, but finding north is still a problem because
of the accuracy of a small
number of observations from a star fix.
Gyrocompasses take some time to get a measurement
( one hour) but even their estimate of North cannot match the
precision that the GPS system can get us with time.
cheers, Neville Michie
If you are taking star shots a stellar compass can easily provide a
boresight pointing accuracy of a few arcsec.
Bruce
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