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: fix with the noon shot...
    From: Dave Boatman
    Date: 1997 Oct 28, 11:50 AM

    I know several people who, like me, use the noon shot for a fix and we don't
    seem to have the theoretical problems brought up:  (1) significant change in
    declination of the sun or (2) of the vessel.
    
    For purposes of sailing, esp. E/W across the Pacific or Atlantic you can't
    come up with an error big enough to big significant.   The sun's declination
    is changing (AND can be accounted for) about .6 to .9' per HOUR and your
    series of shots take but a few minutes (when pre-planned for Local Apparent
    Noon).  So, even without correcting, the error induced is a few hundred
    yards for Pete's sake!
    
    My boat isn't making any appreciable N/S mileage over a few minutes at about
    4kts.
    
    I'll concede to possibly being off a few hundred yards and with that caveat
    you need to take with a grain of salt the grim warnings of the land bound
    theoreticians.
    
    For ships and speedboats you have a more significant problem, esp. if you
    are near land, reefs or channels.   But for sailing.   Sail on and enjoy.
    Noon fixes work GREAT!
    
    Dave Boatman's $.02
    LAKA/Honolulu
    
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
    =-=  TO UNSUBSCRIBE, send this message to majordomo{at}ronin.com:     =-=
    =-=      unsubscribe navigation                                         =-=
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
    

       
    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