[meteorite-list] GPS

From: joeeval_at_excite.com <joeeval_at_meteoritecentral.com>
Date: Thu Apr 22 09:55:47 2004
Message-ID: <20020116020122.A177613B0D_at_xprdmailfe.excite.com>

<br />
--- On Jan 15, 2002, Tom <michguy7_at_mac.com> wrote: <br />
> Which brand GPS do you think I can buy one, megellon or garmin. Also I <br />
> wanted something to hook up to the computer to download data. I could use <br />
> it <br />
> for land and in airplane too. <br />
> <br />
> <br />
> Tom <br />
> <br />
> <br />
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<br />
Tom, <br />
<br />
With the removal of the US military's GPS satellite error (selective availability or "SA")over a year ago, any of the small handhelds will deliver around a 10-30 meter accuracy. I am most familiar with Trimble GPS equipment, but have used a Magellan on occasion. When it came time to upgrade my Magellan handheld, they cut me a great trade-in deal and were very helpful in answering my questions. Maybe you should compare their customer services since their products are comparable. <br />
<br />
Flight navigation should be excellent (no tree/building obstructions) if you have a satellite antenna that's external to the aircraft. I know the Trimble units have a "sea/air/land" feature that will update satellite fixes faster if you are physically moving faster, but their least expensive handheld runs about $3500. You should not depend on GPS altitude readings as they are based on a geoid model rather than the actual shape of the earth. Also, make sure your handheld is set to the same datum (NAD27 or NAD83 if you are using topo maps)that the point you are navigating to was taken in. <br />
<br />
Hope this helps. <br />
<br />
Warren <br />
<br />
<hr>
Received on Tue 15 Jan 2002 09:01:22 PM PST