Valuable on long ocean passages to check the deviation of your steering compass. The Deviation Check is also a requirement of the RYA Ocean Yachtmaster qualification.
Matt Encapsulated A4 Sight form. One side has a completed example with notes explaining where the information is obtained and how it is used.
Designed for use with the Rapid Sight Reduction Tables previously called the Air Tables AP3270. Vol. 2 or 3 and the Nautical Almanac.
Others in the series included the Sun, Sun Meridian Passage, the Planets, Polaris, Stars, Selected Stars and the Moon.
