NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2013 Dec 23, 14:05 -0800
Paul, you were looking for a global geoid calculator. There's one here serving data from the standard EGM96 model which was apparently published in 1996:
http://www.unavco.org/community_science/science-support/geoid/geoid.html
For a more recent geoid model that incorporates significant improvements from recent satellite missions, there's the EGM2008 model from the NGA (the US "National Geospatial-Intelligence Agency, former NIMA)":
http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008/
They've got all sorts of files you can download including detailed global datasets for the deflection of the vertical. Some of these files are rather large.
-FER
----------------------------------------------------------------
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
----------------------------------------------------------------
