THERE IS NO 2011 EDITION OF BOWDITCH. THIS EDITION WAS PRINTED IN 2012, BUT IS THE 2002 EDITION. There is another edition being offered for sale which claims to be the 2011 Edition Contact us for clarification. This edition of The American Practical Navigator, Bowditch, is offered by Celestaire and Paradise Cay Publications. This is the most recent update of Bowditch, the definitive work on navigation. Nathanial Bowditch first published this encyclopedic work in 1802. During the last two centuries over 75 editions, almost 1,000,000 copies, of Bowditch have been published by the US Government. It has lived because it has combined the best technologies of each generation of navigator. This edition includes the latest advances in electronic navigation and digital charting technology. It also covers nonelectronic navigation such as celestial, plotting and dead reckoning. Bowditch contains numerous tables which have been valued for years by practicing navigators. Bowditch is carried on the bridge of every U.S. Navy ship and should be the mainstay of any serious navigator's library. Paradise Cay and Celestaire's present this commercial edition of Bowditch which is a complete copy of the latest Government edition.