By Mary Blewitt. Pbk, 135mm x 215mm, 72 pages, monochrome drawings.
The eleventh edition of this bestselling textbook is proof of the success of Mary Blewitt's concise and clear style in explaining a particularly difficult skill.It has been the bible for many generations of celestial navigators.
This eleventh edition has been completely revised and contains new worked examples related to the current nautical almanac and air tables.