More realistic range for ship guns

Is the ship unsing slingshots ? A 20m range is probably not enough for the rear gun to reach the front of the ship. Nowadays destroyers usually have range of a few dozens kilometers

I'm probably wrong but I though the units were in miles not meters.

Didn't even occur to me it could be in somethng else than metric system ^^ My bad
When you click on a truck though, the stat "distance traveled" is in kilometers; so aybe we just need a clarification on the unit system

@TartarePingouin [ideas] Despite I'm a Korean who uses Metric system as a primary measure system I thought that "m" as Miles because people use Nautical Miles in the sea often.

Fine with me. But in this case, I would have expected to have "mi" (or "nmi" for nautical) for symbol, not just "m"