Know your Nautical Terminology
celestial navigation
Navigation by the position of celestial objects, including the stars, Sun, and Moon, using tools aboard ship such as a sextant, chronometer, and compass, as well as published tables of the expected positions of celestial objects on specific dates. Celestial navigation was the primary method of navigation until the development of electronic global positioning systems such as LORAN and GPS.
sextant
A navigational instrument used to measure a ship's latitude.
As a former practicioner of the arcane and dark art of Celestial Navigation, I found it intuitive. Others had great dificulty. The modern sight reduction forms make it near fool proof. I say near because fools are inventive sorts. Now you can get an app for your phone to do the work. It is all for naught if you can't take your sights properly. Just don't gundeck your sights.
SpyNavy
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)