I know nothing about this subject, but I won't let that stop me pontificating. If it's barometric then it measures altitude using air pressure, which changes with the weather, as well as with the altitude. Mountains tend to make their own weather, so I would have thought a barometric altimeter would have a few problems.
http://wiki.motionbased.com/mb/GPS_Barometric_Altimeter Bob > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Thibouille > Sent: 22 August 2008 09:39 > To: Pentax-Discuss Mail List > Subject: Re: FS Friday: GPS receiver(s) > > I have no experience at all with the use of any GPS. > However, I recently had to look at the theory and how it works... My > memory faded a bit but I remember clearly that altitude was indeed a > problem and *can* be quite different mesured by the GPS or the 'good' > one written on the maps. > > I shall dig a bit and find why exactly... > > -- > Thibault Massart aka Thibouille -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
