A single inboard-engined powerboat in reverse always seems to swing its stern to port. What causes this and how can it be used to advantage?

A. All propellers walk to starboard regardless of rotation direction

B. Prop walk only occurs in reverse on vessels over 10 metres — small powerboats are unaffected

C. Prop walk is a rudder alignment fault — it can be eliminated by adjusting the steering

D. Prop walk: a right-handed propeller (turns clockwise ahead) walks the stern to port in reverse. Use it: when reversing into a berth on the port side, prop walk assists the stern swinging in. When berthing starboard side to in reverse, you must counteract it with rudder

A. The kill cord is only required when travelling above 15 knots

B. If the driver is thrown from the helm, the cord pulls the kill switch stopping the engine — preventing the vessel continuing at speed unmanned (a "circle of death" where an uncontrolled powerboat circles at full throttle striking the crew in the water)

C. The kill cord prevents fuel surging at high speed

D. Kill cords are advisory only — they are not required by law for leisure powerboats

A. Check fuel and kill cord only — all other checks are annual service items

B. Fuel (level, no leaks, correct mix if 2-stroke); oil (4-stroke: check dipstick); engine mounting bolts tight; kill cord condition and function; propeller (no damage, cotter pin present); safety equipment (lifejackets, flares, VHF, bailer, paddle); kill cord attached before starting

C. Run the engine in the water for 10 minutes before departure — no pre-launch checks needed

D. Only check fuel level — outboard engines are self-maintaining