NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John Brown
Date: 2013 Feb 17, 14:23 -0800
Hello Brad and Jean-Marie
Apart from the longitude correction, ABC tables are used in position line navigation to determine the azimuth; also for compass error calculations and great circle bearings. They are quick and easy to use. Errors of the gyro, standard and steering compasses were routinely determined once during every four hour watch in British merchant ships, using azimuth circles on bridge wing repeaters and on the standard compass. The calculation of the true azimuth was usually done using ABC tables.
Atached is a pdf of the full notes in Burtons on the use of the tables and the relevant pages used in the longitude correction example.
Regards
John
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