Question 1

As Chief Officer, what would you expect to find in your vessel's Cargo Securing Manual (CSM), and why is it important?

Accepted Answer

Approved standard and non-standard cargo securing arrangements for the types of cargo carried, including the maximum securing loads (MSL) of lashing points, lashing equipment and patterns, permissible stack weights/heights, and guidance for assessing forces on cargo in various sea conditions, all approved by the flag State or its recognised organisation and required to be carried on cargo ships under SOLAS Chapter VI/VII The Cargo Securing Manual is a SOLAS-required document (Ch. VI, Reg. 5 and Ch. VII as applicable) for ships carrying cargoes other than solid/liquid bulk in a manner that could shift, setting out the approved methods for securing cargo units, vehicles, containers and other cargoes against the forces they may experience at sea (acceleration forces from pitching, rolling and heaving). It typically includes diagrams of standard securing arrangements, the maximum securing load (MSL) for each type of lashing point, fitting and lashing device on board, permitted stacking heights/weights, instructions for non-standard cargo, and guidance for the officer in charge on assessing whether a proposed stow and lashing arrangement is adequate for the expected weather. It must be approved by the flag administration (or a recognised organisation acting on its behalf) and is a key reference whenever planning the securing of deck cargo, vehicles, or any non-bulk cargo that could shift and endanger the vessel.

Question 2

The yacht is loading additional stores and fuel before a long passage, raising the displacement significantly. What effect does this have on stability that you, as OOW, should be aware of?

Accepted Answer

Increased displacement generally raises the centre of gravity if weight is added high up, and free surface effects in partially-filled tanks can reduce the effective metacentric height (GM) Adding weight changes the vessel's centre of gravity depending on where it is stowed, and partially-filled tanks create free surface effects that reduce GM. OOWs should understand these basic stability principles even on smaller vessels without a dedicated loading computer.

Question 3

During a survey, watertight door seals in a transverse bulkhead below the waterline are found to be perished and not closing properly. As Master, what is the significance of this for the vessel's damage stability?

Accepted Answer

Significant — a failed watertight closure compromises the subdivision the vessel's damage stability calculations rely on, potentially allowing progressive flooding between compartments in the event of damage Damage stability calculations assume watertight subdivision functions as designed. A bulkhead door that cannot seal properly defeats that subdivision, allowing flooding to spread beyond the single compartment the design assumed — this must be rectified before further operation.