Re: [Philmont]: GPS Data (Datum)

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From: Alan R. Hamm (ahamm@alanhamm.com)
Date: Fri Jul 19 2002 - 08:58:28 CDT

So I wonder.........if I go into the setup on my gps and change the datum to
NAD27, will the plotted waypoints magically pop into the right locations
based on the exact grid points that I did locate. I might try this.

However, that would just confirm that the map is still incorrect as I read
that WGS84 should be the standard used by default in most of the US.

Unfortunately, because of the fire, we had no pre-determined trek and I
could do no "cyber planning" ahead of time.

Alan Hamm

----- Original Message -----
From: "Signe Rogers" <HikinMama@iglide.net>
Subject: RE: [Philmont]: GPS Data (Datum)

> Yes, map datum is a critical element of GPS usage. I used NAD27 and
> found my waypoints to be accurate most of the time.
>
> I used the NAD27 for datum setting based upon the fact that at
> www.topozone.com those maps match exactly what I find on the Philmont
> maps, even naming most of the camps that you find on a Phil map. The
> Topozone datum is NAD27. I also note that at the bottom of the Central
> map, there is a note that says it is based on datum of 1929.
>
> When I was preparing for the trek, I cyber trekked on Topozone with my
> hard copy PHilmaps beside me for reference.

> Signe Rogers
>

>
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-------------------------------------------------------
As you gather around this virtual campfire with fellow
Scouts and Scouters, do your best to be trustworthy,
loyal, helpful, friendly, courteous, kind, obedient,
cheerful, thrifty, brave, clean and reverent.
-------------------------------------------------------

 

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