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    Re: Amelia Earhart's aerial navigation
    From: Paul Hirose
    Date: 2009 Oct 28, 21:31 -0700

    Ken Gebhart wrote:
    > There is also
    > an instrument called an Astrocompass which is used only in polar
    > regions, and therefore not applicable on this flight.  The
    > Astrocompass is aligned by sighting on the tail of the airplane.
    You're right about sighting on the tail, but polar bit is wrong. An
    astrocompass would have been useful flying from island to island in the
    Pacific. It was part of the B-29 bomber navigator's kit:
    "Once in flight on the way to the [Japanese] Empire, the heading of the
    aircraft should be constantly checked by the astro-compass. It is the
    one completely accurate way of checking heading. Checking on heading
    with the astro-compass does not mean that the compass deviation on a
    heading is found once and then forgotten. Resort to the astro-compass
    should be made at frequent intervals." (XXI Bomber Command, "Combat Crew
    Manual", 1945)
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