My etrex models on only show 4 satellites which may, indeed, be the
problem, folks. Oh well...
BK
>At 09:56 AM 8/13/02 -0700, you wrote:
>>Curious, then, why two different Garmins (etrex units) gave two
>>different readings (altitude and location) from the same position.
>>Has the Clinton order been rescinded? We were in the open, and were
>>getting signals from 4 different satellites.
>>
>>BK
>>
>
>That may be your problem, for any kind of accuracy six good signals is
>minimum.
>
>The tree problem, BTW, is called multiple-path reflections, and resembles
>the kind of distortion woodland leaves impose on our nature sound audio
>recordings.
>
>I have owned two Garmin machines, the GPS-40 for four years and now the GPS
>III+ for three. Both are ,as I keep saying, laughably incompetent at
>altitude. In familiar lowland terrain, I can often guess the altitude
>better than these machines.
>
>For example this morning my Suunto altimeter, with no calibration, said 200
>ft altitude when I took it out of the drawer. The first floor of my house
>is actually 195 ft. This happened (air pressure wise) to need no
>calibrating today, by chance. The GPS III+ read 279, then settled down to
>245, then, half an hour later read 260. All without moving it, with five
>or six satellites.
>
>I wonder why the E-trex ($ 119 at REI Coop) is so much better at altitude
>than the high priced spread III+ ($ 300 at REI)? I think I will call REI
>about it. Maybe I have something mis-set in the many option settings . . .
>
>If you think about the triangluation process, with all the satellites ABOVE
>you, the altitude reading should be at least as accurate as the Lat Long,
>usually better.
>
>
>Marty
>
>
>
>
>Marty Michener
>MIST Software Associates
>PO Box 269, Hollis, NH 03049
>
>
>coming soon : EnjoyBirds, bird identification software for all AOU area.
>
>
>
>
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