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    Re: Universal Transverse Mercator coordinates
    From: Paul Hirose
    Date: 2005 Jul 20, 10:29 -0700

    Robert Eno wrote:
    > Essentially, the Grid reference system for northing tells you how many
    > meters one is from the equator.
    It's close, but not quite exact. An object on a UTM zone's central
    meridian becomes a little smaller when projected onto the grid. An
    object at the edge of a zone expands a little. The maximum scale error
    is about 1 in 1000.
    Directions are distorted too. Meridians (except the central meridian of
    the zone) are curves on the UTM grid.
    So if you follow a course of grid north from the equator to 4000 km
    northing, the track made good on the real world follows a constantly
    changing true course, and is not exactly 4000 km. This is true whether
    you assume the "real world" is a sphere or an ellipsoid.

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