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: Steering accurately
    From: Rodney Myrvaagnes
    Date: 2002 Oct 4, 23:18 -0500

    I don't think this is off-topic at all. I hope it will be pursued
    I have a 13-year-old Plastimo autopilot, analog in its behaviour, that
    came with the wrong O-ring in its control head and got water in. The
    most recent effect is that the +1 and -1 buttons no longer do anything,
    so steering corrections use the +10 and -10 buttons. The alternative is
    to disengage, get on course, and reengage the pilot. Even new, the +
    and - 1 or 10 were not quantitative degrees, just indications of large
    and small corrections.
    With all that, once it is on a course, its internal fluxgate is very
    consistent. It responds to the yaw angle of the boat, of course, not
    the actual track over ground. It steers far more steadily than any
    human being I know.
     3-degree wandering in a fluxgate at rest does not sound normal to me.
    On Fri, 4 Oct 2002 20:38:33 -0400, Eric Haberfellner wrote:
    >Which Autohelm Unit is this? I have recently installed an ST 4000+MK2.
    >As long as we are on this topic, is it normal for the Raymarine fluxgate
    >compass to constantly vary its reported heading +/- 3 degrees from the
    >magnetic compass heading even when the boat is tied securely to a wall in
    >calm conditions with no moving, rolling, pitching or yawing. No one is down
    >below moving large iron masses, the engine is not running and all other
    >electrical or electronic equipment is off.
    >If this message is too far off topic, I apologize.
    >Eric Haberfellner
    Rodney Myrvaagnes                        J36 Gjo/a
    "If Brecht had directed 'Waiting for Godot,'  he would have hung a large sign 
    at the back of the stage reading 'He's not going to come, you know. ' "   -- 
    Terry Eagleton

    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