What is a sextant?

Try using one on rolling ship.

Used one for a 39 year at sea career. When all else fails grab the David White MKII and determine precisely where you are.

With a Lensatic Compass... such is called 'Intersection and Resection'...US ARMY...EIB...

and that is on land!

I have absolutely no sense of direction and tend to navigate via landmarks etc. Even with Google maps, i struggle. I wont be surprised if the Google voice says something rude to me someday while giving me directions "renavigating again...your making me dizzy!"

I have read this somewhere but forgot

Amazing what people have invented. I wonder how the Romans and Vikings navigated.