Good question. Last weekend I carefully marked a waypoint at my takeout before putting in upriver, using about a minute of waypoint averaging. When I returned by river to the same spot, my Garmin 12XL told me I was .12 miles west of the waypoint! This was all done without maps, so the culprit must be selective availability. Robert's suggestion is a good one. My house is within a TOPO! map area, so I think I'll step outside, get a fix, upload it to TOPO!, and see where I am. :-) If a nautical chart program were more accurate, it would probably have nothing to do with the map, but with the software. GPS works the same wherever it is. Nonetheless, as Korzybski once said, the map is not the territory, and some maps are more accurate than others. Chuck Holst -----Original Message----- From: Tomckayak [mailto:Tomckayak_at_aol.com] Sent: Thursday, May 27, 1999 8:24 PM To: Chuck Holst; paddlewise Cc: njohnson Subject: Re: [Paddlewise] Download to Garmin 12X In a message dated 5/25/99 10:27:45 AM EST, CHUCK_at_multitech.com writes: > an also merge files, and, of course, you can also > download waypoints, routes, and tracks from your GPS unit to > Topo!GPS and save them. A track I downloaded from GPS 12 to TOPO GPS showed me paddling though a head land with a 50 foot cliff. I tried a different Datum and it made it worse. The whole track seemed to be off one way or the other. Is it the Garmin or the TOPO maps or the Government induced error factor. Would a Nautical Chart program be more accurate for on the water tracks? *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Fri May 28 1999 - 07:08:53 PDT
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