The practical guide to celestial navigation : step-by-step instructions for when you've lost the plot 
Somerville, Phil. 
 -  Adlard Coles,  2021 
 - 278 pages 
978-1-47298758-7
Nautical astronomy.
623.89 S6961 2021
                        978-1-47298758-7
Nautical astronomy.
623.89 S6961 2021