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    Re: The Noon Fix
    From: Peter Hakel
    Date: 2009 Apr 13, 11:19 -0700
    Dear NavList members,

    The Volume 1 of HO 249 tables intended for air navigation includes "Table 1: Altitude correction for change of position of observer" and "Table 9: Coriolis (Z) correction" table.  This just occurred to me and I haven't thought about this in detail yet.  Could these tables be of any use for the noon curve construction on a vessel moving during the half-hour or so before and after LAN?  I realize that ships do not move as fast as aircraft, but it looks like our aviator friends have already considered and solved this problem, so perhaps we can learn from them.  The only difference should be in the magnitude of the ground speed, which should make the corrections even easier on more slowly moving surface ships.

    ======================================
    Peter Hakel
    http://www.navigation-spreadsheets.com/

    Spreadsheet demos using an iPod Touch:
    http://www.youtube.com/watch?v=usFK4As6_hE
    http://www.youtube.com/watch?v=h8hwHv1hTpc
    ======================================



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