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> > "Stroller"
> > news:MPG.firstname.lastname@example.org...
> > > In article <09vA6.119575$Xt3.email@example.com> to
> > > rec.aviation.hang-gliding, firstname.lastname@example.org says...
> > > > Nope. Set your vario at take off, from a GPS reading then listen
> > > > for the beeps !
> > >
> > > IIRC height reading from GPS is fairly inaccurate.
> > Not sure exactly why GPS should be inaccurate
> Because GPS positioning is done by triangulating your position from
> satellites, which are above.
Q. How many points of reference are required, to determine position, in 3
> There are probably lots of articles on the net about this, if youre
> interested, and appropriate newsgroups might be sci.geo.satellite-nav &
> > - but if so, what is better -
> > internal guidance?
> Erm, sorry. Better for what..? Determining your height..?
> IIRC, airspace is based on a standard of 1012.something at FL0.
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