My boat is 28ft and is classed as a sea going boat, it has port/starboard/running(faces foward only), all round(anchor),stern running light on th the transum, so from behind you would see one white, from the front head on you would see one white above green/red, side one red or green,,,moving left looking fowards on, one red with one white over, green for for moving right with white over
hope this helps, you won,t be wrong if you keep to this