|
|
|
|
|||||
|
||||||
Subject: Re: Sextant Positions versus Map Datums?
From: Pierre Boucher (pboucher@XXX.XXX)
Date: Fri Jan 18 2002 - 00:10:38 EST
>Interestingly enough I have gotten a response on this from the
>ask@XXX.XXX
>
>They directed me to a datum conversion program (CORPSCAN) which is
>publicly available but mainly limited to NAD27 and NAD84, NAD84 arguably
>being "substantially identical" etcetera to the later US domestic datums.
Never heard of NAD84!!!!
maybe you meant WGS84 which is equivalent to NAD83
>Anyway...using CORPSCAN in the area of N40d 35.703m, W073d 29.596m and
>inputting that as NAD84, that position shifts by some 38 meters when
>translated to NAD27. (38 meters found by taking the offsets produced by
>the program and calculating the length of the diagonal.)
You don't need any software is you have a GPS. Just switch from one datum
to another on any waypoint that you have in the machine. You will see the
shift in position.
Pierre Boucher
Pierre Boucher N
Commandant/Retiré
Escadrille des Mille-Îles
|