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    Re: Theoretical Question - Height of Eye from Shore
    From: Gary LaPook
    Date: 2007 Nov 18, 00:13 -0800

    Gary LaPook writes:
    I also use the beach at Ventura for taking sights, I like the one right
    behind the fairgrounds.
    Greg R. wrote:
    >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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