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What do people use to plot routes?
Over here in France, to plot routes on ships and know what direction to tell their helmsman/steerer to aim for, people use the Règle Cras ("Cras ruler", invented by Rear Admiral Jean Cras; As a new user, I can't include links, so unfortunately, you'll have to Google to see what it looks like).
The nice thing about the Cras Ruler, is that it's compact and has no moving parts, so it's pretty long-lasting.
I'm curious to know what sailors use in other countries to plot routes.