Navigation in real life
I was wondering how did submarine found its own position in real life. I mean in the game we have a map that show us our location, but i don't think that at the time there was something like that. Aircraft did use visual reference but in the middle of the ocean .... how? (ok i know about old methods like stars bla bla bla, but i guess that it wasn't used anymore).
Dead reckoning can lead to errors on a long run without reference......So please enlighten my ignorance.
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