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"Stroller" wrote in message
news:TREB6.9268$Ow3.2175988@news2-win.server.ntlworld.com...
>
> "Rufio" wrote in message
> news:%k7B6.126364$Xt3.18105661@news1.rdc1.az.home.com...
> >
> > "Stroller" wrote in message
> > news:MPG.153dd7a825138ea6989707@192.168.1.1...
> > > In article <09vA6.119575$Xt3.17258494@news1.rdc1.az.home.com> to
> > > rec.aviation.hang-gliding, davecawdell@home.com 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
dimensions?


>
> There are probably lots of articles on the net about this, if youre
really
> interested, and appropriate newsgroups might be sci.geo.satellite-nav &
> alt.satellite.gps
>
> > - 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.
>
> Stroller.
>
>

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