one mast head light
boat is under 50m
2 mast head lights
a 50m ship or bigger
3 mast head lights
a 50m boat under tow, over 200m
stern light boat when towing needs?
a yellow light
port light angle?
112.5 deg
starboard light angle?
112.5 deg
masthead white light angle & facing?
facing front at 225 deg
stern light angle and facing?
facing stern at 135 deg