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true virgins make dull companions


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  • Correction to oroboros' comment:
    This formula converts True Course to Compass Course. Magnetic course is the middle step (TV*M*DC)

    (T)rue course +/- magnetic(V)ariation = (M)agnetic course
    (M)agnetic course +/- compass(D)eviation = (C)ompass course

    February 20, 2009

  • This is a mnemonic for the formula to convert True Course into Magnetic Course by applying the known magnetic variation for the locale over which a pilot is navigating his craft. Nowadays all done by "black box" computer technology.

    (T)rue course +/- magnetic(V)ariation - compass(D)eviation = magnetic(C)ourse

    January 2, 2007