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    Re: Bubbles at sea
    From: Hewitt Schlereth
    Date: 2008 Jul 13, 22:34 -0400

    I am absolutely astounded at the results Weems got. I tried my Navy
    Mark V a few times from a 40-foot yawl and my LOPs with the bubble and
    averager were never closer to the DR than 40 NM. Using the horizon
    prism and averager I got results comparable to what I got with my
    Ebbco - LOPs at distances from the DR of 5% to 10% of the distance run
    since the last fix. My guess is that Weems was on a true ship where
    the period of roll and pitch in decent going might be comparable to
    that of an aircraft.  -HewS
    
    On 7/13/08, d walden  wrote:
    >
    > Attached is a table from Weems, Marine Navigation, 1940 showing accuracy of
    > bubble sextant measurements at sea.
    >
    > It seems from the text Weems thought they would prove quite popular.
    >
    >
    >
    >  >
    >
    >
    
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