The view of the water’s surface from any conning position on the navigation bridge shall not be obscured more than one (1) ship length forward of the bow, under all conditions of draught and trim.

The view of the sea surface shall not be obscured from the conning position forward of the bow by more than the lesser of two ship lengths or 500 m (1,640 feet) from dead ahead to 10 degrees on either side of the vessel. Within this arc of visibility the blind sector caused by cargo, cargo gear, or other permanent obstructions must not exceed five degrees.

The view of the water’s surface from any conning position on the navigation bridge shall not be obscured more than two (2) ship lengths forward of the bow, under all conditions of draught and trim.

The view of the water’s surface from any conning position on the navigation bridge shall not be obscured more than one and one half (1.5) ship lengths forward of the bow, under all conditions of draught and trim.