Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Dip uncertainty
    From: Fred Hebard
    Date: 2004 Dec 7, 14:54 -0500

    On Dec 6, 2004, at 11:48 PM, Trevor J. Kenchington wrote:
    
    > Fred,
    >
    > You wrote:
    >
    >> On Dec 6, 2004, at 9:16 AM, Trevor J. Kenchington wrote:
    >>
    >>> With anything of a sea running, of course, the uncertainties in the
    >>> horizon and in the true height of eye that are produced by wave
    >>> action
    >>> are likely to overwhelm anomalies in dip for an observer close to the
    >>> sea surface (except perhaps under the most extreme conditions).
    >>>
    >>
    >> Bruce Bauer had exactly the opposite take on this.
    >
    >
    > Can you provide a page reference? I have re-read his section on
    > rough-weather techniques and I can't find that he mentioned height of
    > eye. Or do you mean his comment that a navigator on a ship's bridge
    > should allow for wave height when applying the dip correction whereas a
    > yachtsman should not?
    >
    
    I meant his comment about allowing for wave height.  My take on it was
    that he thought the small boat guy was better off.  This might be true
    in a smooth high sea, if one could be quick enough to get the sight.
    Put some chop on top of big rollers and it might be a different story.
    I myself have never experienced this, to my regret.
    
    Fred
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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