A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Metric Bookmark Kamal
From: Greg Rudzinski
Date: 2016 Mar 17, 10:00 -0700
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.
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.
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