- Ships of not less than 45 m in length, as defined in regulation III/3.12, constructed on or after 1 July 1998, shall meet the following requirements: The view of the sea surface from the conning position shall not be obscured by more than two ship lengths, or 500 m, whichever is less, forward of the bow to 108 on either side under all conditions of draught, trim and deck cargo; No blind sector, caused by cargo, cargo gear or other obstructions outside of the wheelhouse forward of the beam which obstructs the view of the sea surface as seen from the conning position, shall exceed 108. The total arc of blind sectors shall not exceed 208. The clear sectors between blind sectors shall be at least 58.
The horizontal field of vision from the conning position shall extend over an arc of not less than 2258, that is from right ahead to not less than 22.58 abaft the beam on either side of the ship;
From each bridge wing, the horizontal field of vision shall extend over an arc of at least 2258, that is from at least 458 on the opposite bow through right ahead and then from right ahead to right astern through 1808 on the same side of the ship; From the main steering position, the horizontal field of vision shall extend over an arc from right ahead to at least 608 on each side of the ship;
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