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Re: [MSAR] GPS Tip

From: "Charles L. Sparke" <clsnv@sbcglobal.net>
To: Mounted search and rescue <msar-riders@lists.ibiblio.org>
Subject: Re: [MSAR] GPS Tip
Date: Tue, 27 Feb 2007 15:03:49 -0800

First guess is that the person laying out the course was using one map datum (probably NAD27 or WGS84) and the rest were using the other one. In my area (northern Nevada) the difference is about 100 meters east-west and about 15 north-south) in other parts of the US it could well be that far off.

Remember, unless you've got access to military maps, most civilian available maps are still gridded using NAD27 map datum. Aircraft and never military (1985 on) are gridded using WGS84. If you're plotting, be sure to match the map datum on your GPS to the map you are using.

Charles Sparke
Pershing County SAR
Lovelock, NV

[MSAR] GPS Tip, Chuck Daniel, 02/27/2007
- Re: [MSAR] GPS Tip, wendy, 02/27/2007
  - Re: [MSAR] GPS Tip, Una Smith, 02/28/2007
- Re: [MSAR] GPS Tip, Jorene Downs, 02/27/2007
- Re: [MSAR] GPS Tip, IRVIN LICHTENSTEIN, 02/27/2007
- Re: [MSAR] GPS Tip, Charles L. Sparke, 02/27/2007
  - Re: [MSAR] GPS Tip, Marie Lester, 02/27/2007
- Re: [MSAR] GPS Tip, Una Smith, 02/27/2007
  - Re: [MSAR] GPS Tip, Patty Montoya, 02/28/2007