See: http://www.fs.fed.us/database/gps/datum/index.htm
http://answers.yahoo.com/question/index?qid=20070601063953AA8Rylt
gl
--- On Tue, 8/14/12, Gary LaPook <garylapook@pacbell.net> wrote:
From: Gary LaPook <garylapook@pacbell.net>
Subject: [NavList] Re: Longitude shift on NOAA charts vs. Google Earth
To: NavList@fer3.com
Date: Tuesday, August 14, 2012, 10:33 AM
The datum of your chart is most likely NAD 27 (North American Datum of
1927) and Google Earth uses a different datum, WGS 84.
gl
--- On Tue, 8/14/12, G Becker <george@gwbeckerpls.com> wrote:
From: G Becker <george@gwbeckerpls.com>
Subject: [NavList] Longitude shift on NOAA charts vs. Google Earth
To: NavList@fer3.com
Date: Tuesday, August 14, 2012, 8:37 AM
Sorry if this has been covered before.. On my office wall I have an older NOAA chart (1979). I mark the Lat/Long of various sites on the chart using data from Google Earth. The marks are made in alignment with the NOAA chart scales found around the border. Comparing the two versions of Lat/Long, Google's data is
always shifted approximately 1/4 Nautical mile toward Greenwich. Latitude is always accurate. If my data is not incorrect, what would be the difference in the two Lat/Long systems?
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