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    Theoretical Question - Height of Eye from Shore
    From: Greg R_
    Date: 2007 Nov 16, 18:30 -0800

    OK, here's a question for the theorists on this list... If I'm doing
    sextant shots from shore (vs. on the water itself), do I need to factor
    in the height of the tide into my He corrections?
    I actually surveyed one of my favorite locations with a handheld
    transit/bubble level device and a surveyor's rod (to get an elevation
    measurement accurate to within a couple of inches or so), but it dawned
    on me that measurement would only be valid for the state of the tide at
    the time.
    This particular location (Ventura, CA) doesn't have a huge tidal range
    - maybe 3-4 feet - but it got me to thinking that other locations with
    a much greater tidal range would probably be affected enough to where a
    correction would be necessary to get the same accuracy that you'd
    expect from being on the water.
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