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    Re: Theoretical Question - Height of Eye from Shore
    From: Greg Rudzinski
    Date: 2007 Nov 16, 18:45 -0800

    The Dip correction is referenced off the oceans surface therefor if
    you are on land the height of tide would have to be taken into
    account. If you are on a floating dock then the tide will have no
    effect on the dip.
    
    Greg Rudzinski
    
    On Nov 16, 6:30 pm, "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.
    >
    > --
    > GregR
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