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: Magnetic variation changing faster than anticipated
    From: Mark Coady
    Date: 2019 Feb 27, 18:03 -0800


    Most correct, I missed that one, I just often tend to think of collsion avoidence more on my radar tracking, spoiled as I am.  A pelorus does the job perfectly on visible targets. Risk of Collision:  Constant bearing, decreasing range as per COLREGS Rule 7.

    The other one I did a poor job noting is the use of the steering compass for a maintaining directional stability on a small boat in a heavy sea, especially one that slaps you around on the quarter and skews your course constantly.  GPS's take time to stabilize heading, vs a steering compass that gives you an instant visual and reaction feedback on your countersteer.

    You actually use the compass to learn and anticipate the magntude of the swing.  You can often tell an experienced helmsmen in a rough sea by his smoother track, vs an inexperienced one who doesn't anticipate and correct for motions well.  Often overcorrection is the enemy so the vessel is constantly yawing about the base track. Its the time delay between the motion and response to helm command that creates the problems, with good compass work a way to solve them. 

    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