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    Inverse Grid Magrader Chart
    From: Brad Morris
    Date: 2010 Apr 22, 11:16 -0700

    I am reading the "Army Observer's Report of Operation Highjump", Task Force 68 US Navy.

    Of the navigation reported, the observer reports
    1) Beacon Navigation. Homing to the runway by a beacon.
    2) Use of the astral or sun compass
    3) Magnetic compass
    a) For the LVT (ground expedition). Observer states not adequate due
    to swing or oscillation of the compass needle.
    b) For air navigation, the observer states that the compass, with known
    variations provided an ability for "a fairly good course"
    4) Sun Lines of Position!

    There is a reference to an "Inverse Grid Magrader" chart and an "inverse grid computer". I would suspect the inverse grid computer to be some type of slide rule. My question is about the Inverse Grid Magrader chart. Has anyone heard of this before? Internet searches yield no help. Could it be that the Army Observer transliterated Mercator to Magrader?

    A little help would be appreciated!

    Best Regards
    Brad
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