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: Variation of compass
    From: Herbert Prinz
    Date: 2002 Oct 3, 00:13 +0000

    This is an inherent limitation of the underlying prediction model. It's a
    compromise between better reliability for a shorter time or lesser accuracy for
    a longer time. DMA chart 42, or whatever else one might use in its place,
    suffers the same limitations. It's all based on the same methods and data.
    
    Herbert Prinz
    
    
    Robert Eno wrote:
    
    > [...] GPS receivers have a built-in program that provides the magnetic
    > variation for
    > any place on the planet. The drawback to this feature is that is only valid
    > for a certain epoch which I think is no more than 5 - 10 years.
    
    
    

       
    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