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    Re: How accurate are fixes in practice?
    From: Jeremy C
    Date: 2008 Jul 11, 23:52 EDT

    In general, a merchant ship has from about 20-40 meters of height of eye from the bridge.  On a 100 meter vessel, it is a bit lower, with most larger ships around 30 meters.
     
    My normal Celnav fixes are usually within 3 nm and I am disappointed by worse results.  Sunlines are usually within 1 nm when I use the GPS fix as the AP, as are LAN observations.
     
    I don't envy those who need to shoot from small vessels.  I have never done so, and can't say that I'd like to.  My worse conditions are 20 degree rolls with periods of 10-15 seconds.  That can get irritating, but not insurmountable.
     
    Jeremy




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