[KaleunMarco]

Originally Posted by torpedobait

I have found that with reasonable visibility and weather the coastal guns have a shooting range of up to 6 NM. I always use the compass to draw a 6 NM circle around any known coastal guns, and never go inside that range, unless it is very dark and/or raining. They will easily see and kill you on a clear night, as you may have noticed!

i concur with tbait. after extensive play in coastal situations i do exactly what tbait does: as i approach an enemy and detect coastal batteries, i start drawing 6 nm (12km if playing the german side) circles using the battery as the center point.
good luck.