As the title ask's...I've tried google and even asked in game, no definitive answer so far. So please, what does one square on the map represent in kilometres?
Ok, so let me explain something first.
As I said, Naval Action has its own projection that does not line up with any map I know of. The units of distance of the real world do not match up.
In Naval Action we have two things: knots, and coordinates. We used to have latitude and longitude, but those corresponded to a certain distance of f11 coordinates and didn't correspond to actual latitude or longitude.
About 400 coordinate units is about how far you travel per unit of knot pe