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    Re: Calibrating the Practice Bubble Horizon with a sea horizon
    From: Bill B
    Date: 2014 Mar 17, 17:58 -0400

    On 3/17/2014 5:36 PM, Sean C wrote:
    > I think that's what the instructions say:
    Thanks. I bought this maybe 9 years ago and was far from a sea horizon,
    so used the method I described earlier with LAN. It only dawned on me
    two years ago it could be fear easier to use a natural horizon, but I
    hadn't thought it through until now. I'll have to look for the
    instructions. :-)
    It was about 2 years ago that Alex and I enjoyed the 85F weather (about
    40F water if memory serves) on the St. Joe, MI north pier and had an
    almost 10' error with both operators and sextants. I wonder if once
    properly calibrated the PBH could act as a dip meter of sorts to
    indicate gross errors? Am not knowledgeable to understand what portion
    of the error could be accounted for with and dip, and what portion from
    a strange lapse rate between the visible horizon and the body.

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