A relatively inexperienced OOW, confident in the twin-screw vessel's manoeuvrability, attempts a tight turn close to a berth without tug assistance in stronger wind than usual, reasoning that "twin screw can handle it." Partway through, the vessel is not responding as predicted and is drifting toward the berth. What is the most important lesson here for ship-handling judgement generally?

A. Manoeuvrability capability (twin screw, thrusters, or any other feature) is not a substitute for a proper risk assessment of the specific conditions on the day — confidence in equipment capability should not replace a deliberate judgement about whether today's wind, space, and margin for error genuinely support a manoeuvre without backup (tug) assistance

B. The lesson is purely technical (a specific engine/rudder command was wrong) with no broader judgement lesson involved

C. Tug assistance should never be considered necessary for any twin-screw vessel under any wind condition

D. Twin-screw vessels are always capable of completing any manoeuvre regardless of conditions, so the OOW's only error was in execution, not judgement

A. Twin-screw vessels are always faster than single-screw vessels of the same size, which is their only real advantage

B. Twin-screw vessels are unaffected by wind or current, unlike single-screw vessels

C. Differential thrust — running the two propellers at different speeds, or in opposite directions, generates a turning moment independent of rudder angle or forward speed, giving far greater control in close quarters, including the ability to turn the vessel almost in place

D. There is no meaningful manoeuvring difference between twin-screw and single-screw vessels

A. By running one propeller ahead and the other astern with both rudders turned toward the same side (often "outward" relative to the direction of intended lateral movement), the resulting forces can largely cancel fore-and-aft motion while combining to push the vessel sideways — the exact technique and rudder angles vary by vessel, but the principle is using opposed thrust plus rudder deflection to convert rotational/thrust forces into a net sideways force

B. It requires both propellers to run at identical speed and direction with rudders centred

C. Twin-screw vessels cannot move sideways under their own power under any circumstances and always require tug assistance

D. Walking sideways is achieved purely by wind effect and has nothing to do with engine or rudder configuration