[time-nuts] OT - GPS and North

[Neville Michie]

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