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    Re: Climbing the Gravity Hill at Bermuda
    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
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