NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Longitude shift on NOAA charts vs. Google Earth
From: Lu Abel
Date: 2012 Aug 14, 16:19 -0700
I just brought up Google Earth and dropped the crossbars at the southern end of the bridge that drops into the western side of Savannah. On both Chart 11513 and Google Earth I get the coordinates as Lat 32d 5.3m N, Long 81d 6.0m W. What do you measure on your chart??
Lu
From: Lu Abel
Date: 2012 Aug 14, 16:19 -0700
George:
In the current edition of 11513, which can be viewed on-line at http://www.charts.noaa.gov/OnLineViewer/11513.shtml,
on the left margin of the chart just below Savannah there is a note that the NAD27 vs NAD83/WGS84
corrections are (going from NAD27 to WGS84) are 0.737" north and 0.609" east. So these corrections are of less than 100 feet, much less than what you're seeing from Google Earth.
I just brought up Google Earth and dropped the crossbars at the southern end of the bridge that drops into the western side of Savannah. On both Chart 11513 and Google Earth I get the coordinates as Lat 32d 5.3m N, Long 81d 6.0m W. What do you measure on your chart??
Lu
From: G Becker <george@gwbeckerpls.com>
To: NavList@fer3.com
Sent: Tuesday, August 14, 2012 11:49 AM
Subject: [NavList] Re: Longitude shift on NOAA charts vs. Google Earth
Lu, the chart is NOAA 11513 15th edition, July 21, 1979. The chart is 36"x48".
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------
