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I would like to thank the NAVLIST for a very helpful and informative
response. I have applied some of the suggestions successfully using a
U.S. Navy MK 5 world war 2 bubble sextant. I did notice that a large
formed bubble was steadier than a small formed bubble. The U.S. Navy
MK 5 reads to 2 minutes of arc but can be visually interpolated to the
nearest minute of arc. I haven't noticed any dip anomalies yet. I have
been able to determine an unknown height of eye to within three
feet.

On Mar 13, 1:22 pm, Greg Rudzinski  wrote:
> Question for NAVLIST: Can a bubble sextant be used to measure dip
> anomalies from a known height of eye? This would be a negative
> measurement in minutes from bubble to horizon.
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