Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    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
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site