Hi Dave, > Try browsing chapter three here- > >http://www.gmat.unsw.edu.au/snap/gps/gps_survey/principles_gps.htm > >I have trouble getting my head round some of this stuff as well and >found it a useful read. >DaveB
That looks really excellent, I'll go off and study - thank you for the link.
And thanks again to Matt for his further explanation.
Peter
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