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
    Horizontal Angle and the Hand Bearing Compass
    From: Greg Rudzinski
    Date: 2011 Jun 3, 13:54 -0700

    Try taking a horizontal angle using a hand bearing compass the next time out sailing. This only requires taking the difference between two bearings and plotting the arc of position. This adds a third line of position to the pair of magnetic bearings and will act as a deviation check. My favorite way to plot a horizontal angle is to take half the distance between mark A and mark B then divide by the SIN of the angle between mark A and mark B. The result is the radius of the circle which passes through the observer and marks A & B. Plot the circle by first marking off the circle center using the radius distance arced off marks A & B. From the circle center then trace the cirlce that will pass through mark A & B and the observer. I find this technique very quick using only a divider compass and pocket trig calculator.

    Greg Rudzinski
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com

    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