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Subject: Re: Electronic vs non-electronic
From: Rodney Myrvaagnes (rodneym@XXX.XXX)
Date: Sun Oct 03 1999 - 22:14:57 EDT
I don't think you answered his question. If the island, reef, etc. is charted wrong, celestial will not find it correctly, except by
accident.. Datum discrepancies the same. Ellipsoid, same.
GPS system errors are not significant in this context. 100 meters is closer than you are likely to get with celestial anyway.
If you are close enough to anything that gps discrepancies would matter, on a chart that is not corected to a stated and known
datum, you are piloting on your own. Celestial is irrelevant in such a situation.
On Sun, 3 Oct 1999 19:24:48 -0400, Craig wrote:
>
>There are several problems associated with making GPS positions jibe with charted positions, including:
>
>-’’GPS system errors
>-’’datum errors
>-’’charted position errors
>- elipsoid (theoretical sphere on which GPS is based) vs. geoid (actual surface of the earth) differences
>
>etc
Rodney Myrvaagnes J36 Gjo/a
Associate Editor Electronic Products
20+ years without a Car, a TV, or a website
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