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    Re: Air Almanacs, Air Navigation
    From: Fred Hebard
    Date: 2005 Aug 4, 10:52 -0400

    I don't know about air navigation, but a lot of small boat (yacht)
    navigators prefer the Air Almanac because it's quicker to reduce sights
    by hand and they can't get more precise than 1.0 arcminutes due to the
    instability of their platform.  Nowadays, however, few use celestial,
    so the demand may be dropping.  It sure is a nice backup, however, for
    electronics on a small boat, not to mention the remote possibility of
    lifeboat navigation.
    On Sep 3, 2005, at 9:42 AM, Robert Eno wrote:
    > The short discussion on negative altitudes and my reference to the Air
    > Almanac and HO 249 prompts me to ask the following questions:
    > 1. Is anyone still using the Air Almanac?  Has there been any
    > discussion pertaining to discontinuing it?
    > 2. Is anyone still using celestial for air navigation?
    > Robert

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