'You're at sea if you know this length is 1 mean minute of arc on the meridian'
a knot (or nautical mile)
AT GREAT LENGTHS: Youre at sea if you know this length is 1 mean minute of arc on the meridian
You're at sea if you know this length is 1 mean minute of arc on the meridian
You're at sea if you know this length is 1 mean minute of arc on the meridian
AT GREAT LENGTHS
a knot or nautical mile
AT GREAT LENGTHS