Masthead light means a white light, visible throughout a horizontal arc of 225° and projecting a uniform uninterrupted beam over 112° 30' on each side, i.e. from the bow to 22° 30' abaft the beam on each side.
Luč na vrhu jambora pomeni belo luč, ki je vidna prek celotnega horizontalnega loka 225° in ki oddaja enakomeren neprekinjen žarek prek 112°30' na vsako stran, tj. od premca do 22°30' za pravokotnico na vsaki strani.