3.1 Every effort should be made to place the navigation
bridge above all other decked structures, not including funnels, which
are on or above the freeboard deck.
3.2 The view of the sea surface from the conning
position should not be obscured by more than two ship lengths, or
500 m, whichever is less, forward of the bow to 10° on either
side irrespective of the ship's draught, trim and deck cargo.
3.3 Blind sectors caused by cargo, cargo gear
and other obstructions outside of the wheelhouse forward of the beam
obstructing the view of the sea surface as seen from the conning position,
should not exceed 10° each. The total arc of blind sectors should
not exceed 20°. The clear sectors between blind sectors should
be not less than 5°. However, in the view described in 3.2, each
individual blind sector should not exceed 5°.
3.4 The height of the lower edge of the navigation
bridge front windows above the deck should be kept as low as possible.
In no case should the lower edge present an obstruction to the forward
view as described in these guidelines.
3.5 The upper edge of the navigation bridge front
windows should allow a forward view of the horizon, for a person with
an eye height of 1,800 mm, at the conning position when the ship is
pitching in heaving seas.
3.6 The horizontal field of vision from the conning
position should extend over an arc from more than 22.5° abaft
the beam on one side, through forward, to more than 22.5° abaft
the beam on the other side.
3.7 From each bridge wing the field of vision
should extend over an arc from at least 45° on the opposite bow
through dead ahead and then aft to 180° from dead ahead.
3.8 From the main steering position the field
of vision should extend over an arc from dead ahead to at least 60°
on each side.
3.9 The ship's side should be visible from the
bridge wing.