There is an excellent discussion of GPS on sci.geo.satellite-nav newsgroup.
Many applications of GPS are available for research and navigation.  I
never go anywhere without one, air, sea or in the field.
 
 
 
 
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On Sun, 8 Jan 1995, Ben A.G.Fuller wrote:
 
> Those of you interested in pursuing GPS for various surveying projects should
> check out the maritime navigation sources, and fully understand the differenti
al
> gps issue. (The DOD has intentionally degraded the accuracy of GPS, but there
is
> a calibration work around.) For more than just recording where you are, I high
ly
> recommend a unit with a full numberical keypad for entry of lat long survey
> points etc. There are interfaces to marine chart software for both the Mac and
> IBm available, but I suspect taht no one has yet started loading topo maps or
> ordnance survey maps ( at least off the shelf).
>
> Benj. A.G.Fuller
> seabag enterprises
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>