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: Metric Bookmark Kamal
    From: Greg Rudzinski
    Date: 2016 Mar 17, 10:00 -0700

    Francis,

    10' accuracy from the Canary Islands (Lat. 28° N) is very good using a kamal and Polaris. The kamal works best below 12° of altitude which limits the star choices at twilight. Night adapted eyes would probably get the job done. Moon light will work. I recommend using 56cm (22 inches) for string (dowel) length to allow for 1cm from the front of the eye to the center of the eye. 

    Greg Rudzinski

    From: Francis Upchurch
    Date: 2016 Mar 17, 07:46 -0700

    Great Kamal and results Greg,

    I made a simple Kamal a la Burch a few years ago using a small plastic ruler marked in cms. With a string 57cm long, 1 cm =1°.

    I only did a few latitudes with it, sun or polaris (when on holiday in the Canaries.Polaris. Hs too big in N Europe for a Kamal) and only got to within about 10' of correct Lat.

    Does anyone know whether the Arab, Indian and Chinese sailors knew about Polaris correction and declination of the sun in order to work out latitude? I read somewhere that the Arabs, crossing the Indian ocean used different size strings for different ports of call. 

    Best wishes

    Francis

       
    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