12th edition 1995, revised January 2006. Both volumes I & II are officially recommended by the Merchant Navy Training Board, and form the most up-to-date survey of the Science of Navigation in print.
10th edition revised and rewritten December 1987; Reprinted 2010. Both volumes I & II are officially recommended by the Merchant Navy Training Board, and form the most up-to-date survey of the Science of Navigation in print.