What is panama canal requirements of minimum visibility as per SOLAS ? |
MGA02

What is panama canal requirements of minimum visibility as per SOLAS ?

Panama Canal requirements of minimum visibility:

The surface of the water must be visible one ship length forward from conning positions Nos 1, 2, and 3, when the vessel is laden. If the vessel is in ballast condition, the surface of the water must be visible 1.5L forward.
Despite of these requirements, checking the ship visibility is often limited to define just two visibility lines: one according to SOLAS and another one as required by Panama Canal (for one L).

Both lines for the ship without trim and on full draught only. Any change of draught and/or trim will destroy such theoretical visibility. For this reason the master shall be provided with a detailed analysis of visibility taking into account various arrangements of deck cargo, various values of trim and draught.

All new vessels shall be provided with a Loading and Stability Manual containing a reasonable number of the Visibility Tables showing blind sectors as function of draught and trim. Another option is to provide ships with a separate Visibility Plan used as an appendix. The Visibility Plan shall be prepared as a part of As Build Drawings. It should contain the classification drawing Navigational Bridge Visibility and the Visibility Tables.

All new vessels shall be provided with a Loading and Stability Manual containing a reasonable number of the Visibility Tables showing blind sectors as function of draught and trim. Another option is to provide ships with a separate Visibility Plan used as an appendix. The Visibility Plan shall be prepared as a part of As Build Drawings. It should contain the classification drawing Navigational Bridge Visibility and the Visibility Tables.

  • 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; 

 The ship’s side shall be visible from the bridge wing; The height of the lower edge of the navigation bridge front windows above the bridge deck shall be kept as low as possible. In no case shall the lower edge present an obstruction to the forward view as described in this regulation; 

 The upper edge of the navigation bridge front windows shall allow a forward view of the horizon, for a person with a height of eye of 1,800 mm above the bridge deck at the conning position, when the ship is pitching in heavy seas. The Administration, if satisfied that a 1,800 mm height of eye is unreasonable and impractical, may allow reduction of the height of eye but not to less than 1,600 mm;manish-mayank

 

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