This 440 page almanac is accompanied by a ‘2011 Celestial Navigation CDROM’ This Celestial Nav program for 2011 computes navigational sailings, compass errors and the calculation of sextant sight observations and includes a Sky chart, Planetarium, Plotting Sheets. In addition to the information supplied in your typical almanac, Witherbys Nautical Almanac includes: 20 pages of country information, including time zone, population, currency, Int’l dialing codes and details of their merchant fleet 8 pages from a booklet ‘Celestial navigation Explained’ that take you from the basics to resolving a cocked hat problem A worked example on using the ‘Concise Sight Reduction tables of The Nautical Almanac’ 8 pages of formulae and conversion factors Update on bridge equipment required, AIS, ARPA, BNWAS, ECDIS,GALILEO, VDR and GMDSS 5 pages on the use and care of the sextant 2 pages on the use and care of an azimuth mirror 2 pages on the magnetic compass 6 pages of worked navigational examples in the year 2012 using the Witherbys Nautical Almanac Colour star charts