Why does a heavy suspended load on an extended crane jib reduce the DP vessel's heading-keeping capability?

A. A load at extended radius creates a large heeling moment athwartships, increasing the vessel's roll response and making it harder for the DP system to maintain heading in beam seas — the DP system must provide greater transverse thrust to counter both the environmental forces and the crane-induced roll, reducing the margin available for heading changes

B. A suspended load reduces fuel consumption, which limits available thruster power

C. The load reduces heading capability only if the crane is deployed on the port side

D. The heading capability is unaffected by crane loads — only position-keeping capability is reduced

A. Crane lifts only matter for DP if the load exceeds the vessel's Safe Working Load

B. Lifting a heavy load shifts the vessel's centre of gravity upward and athwartships (depending on crane position), altering the vessel's roll and pitch characteristics and therefore the environmental force response — a DP system not updated with the correct crane position and load may miscalculate the forces needed to maintain position, reducing accuracy

C. Crane lifts have no effect on the DP model — only weather forces are modelled

D. The DP system automatically compensates for crane loads through the load cell feedback

A. Pendulation is the rotation of the crane jib, not the load

B. Pendulation has no effect on DP — it is a rigging safety concern only

C. Load pendulation is the swinging of a suspended load in an arc below the crane hook, which creates a dynamic, oscillating side force transmitted through the crane structure to the vessel hull — the DP system must counter this cyclic force, and the constant changing direction of the force can cause oscillating thruster demands that stress both the DP system and the power management system

D. Pendulation only occurs when the load is in the water, not when suspended in air