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    Bubble Sextant as Dip Meter
    From: Brad Morris
    Date: 2015 Oct 23, 16:52 -0400

    I was reading HO551, Manual of Ice Seamanship.

    After a discussion of abnormal refraction and the care a navigator should take in regards to it, the following interesting statement is made

    "If the motion of the ship permits use of a bubble sextant, it can quickly be determined whether the apparent horizon is appreciably displaced"

    The manual gives no further information. 
    Am I to infer that a bubble sextant can be used as a dip meter.  Or is it merely a gross check, as in 'the horizon is far from normal'.

    Has anyone tried this?  Can a bubble sextant be used as a dip meter?

    Brad

       
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