Dennis:
The GPS will never get altitude as accurately as longitude and latitude. It
has to do with the geometry of the satellites and the earth in solving the
height. Your best bet for altitude measurement is an adjusted
barometer/altimeter. Variations of 8,000 to 12,000 feet shows something is
wrong, I would expect altitude with GPS to be good to about 200-300 feet or
better.
Jim Nolan P-19 #426 Panache Colorado
>From: denis4x4@frontier.net
>Reply-To: WWPotter@egroups.com
>To: WWPotter@egroups.com
>Subject: [WWP] GPS Accuracy
>Date: Wed, 3 May 2000 21:09:59 -0600 (MDT)
>
>When I'm not sailing my P-15 or cruising the drive-ins in my '31 Ford
>Speedster, I do a lot of 4-wheeling in the San Juan Mountains. I'm on my
>third GPS. It seems that the smaller and cheaper they get, the better the
>performance. I have checked highway speeds, rock crawling speed,
>direction, topo map locations, etc. and the only thing that is inaccurate
>is
>the altitude readings. I used a $125 handheld unit to find survey sticks
>for
>a mining claim patented in 1906 and the readings were dead nuts. However, I
>can be parked right in front of the Lizard Head Pass sign saying that the
>altitude is 10,280 and the GPS will bounce from 8,000 feet to 12,000 feet
>and there will be no steady reading. My $300 GPS was 10' off the San Diego
>#1 entrance buoy and I found Avalon in a peasoup fog. I wonder if they
>really will be anymore accurate on the water than they were before. I'll
>hit a couple of mountain passes tomorrow to checkout the altitude readings.
>If anybody needs the cordinates for the Burger Boy in Cortez, Sonic
>Drive-In
>in Durango or Farmington NM, let me know!
>
>Dennis Pierce
>Gypsy Witch V #1207
>Durango CO
>
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