How To Calculate Compass Error by Azimuth of a Star! A short video where I explain how to calculate a ships Gyro or Magnetic compass error from a bearing of a Star in this case Arcturus, by calculating the direction (or azimuth) of the Star.
Ask any questions in the comments – I’ll do my best to answer them.
Pro Forma: http://www.alistairbaillie.co.uk/blog/?attachment_id=1110
NOTE: This video makes use of selected pages from the British Admiralty Nautical Almanac (Admiralty Publication NP314). The example uses the 2016 version of the publication so if you’re doing the calculation for a different year the numbers won’t be the same.