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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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