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    Re: astrocompass still in use
    From: Robert Eno
    Date: 2002 Sep 26, 21:51 -0400

    Thankyou very much for the most interesting story.
    Whatever happened to the concept of astro-trackers?  It seems to me, with
    today's microchip technology, this device could be much improved and reduced
    considerably in size.
    At one time or another, we have all discussed the concept of a
    self-contained back up system to GPS. It appears to me that an astro-tracker
    would be an excellent device to fit this bill. Notwithstanding that it is
    another "black box".
    It kind of reminds me of a sextant that was described on page 158 of Bruce
    Bauer's "The Sextant Handbook". The sextant described is called a "Celnav"
    and is pretty much a hand-held, modified version of the astro-tracker. Does
    anyone on the list know what happened with regard to its development?
    Has GPS pretty much stifled the development of any other method of position
    ----- Original Message -----
    From: Dan Allen 
    Sent: Thursday, September 26, 2002 12:24 AM
    Subject: Re: astrocompass still in use
    > The SR-71 Blackbird also had a very sophisticated star tracker.  Here
    > is an extract from "SR-71 Revealed, the Inside Story", by Richard H.
    > Graham, pages 65-68.  Richard Graham was an SR-71 pilot for many years.
    >   This is his own description of the system.

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