What is the primary purpose of an immersion suit, as distinct from a lifejacket?

A. An immersion suit provides thermal protection by keeping the body dry and insulated in cold water, significantly extending survival time before hypothermia sets in — a lifejacket alone provides buoyancy but no meaningful thermal protection

B. An immersion suit replaces the need for a lifejacket entirely in all conditions

C. Immersion suits are only required on vessels operating in tropical waters to prevent sunburn

D. An immersion suit is simply a more comfortable alternative to a lifejacket with identical buoyancy properties

A. There is no requirement to check personal survival equipment individually — the safety officer checks it on behalf of the whole crew

B. Only once the first boat drill is scheduled, which may be several days after joining

C. Only senior officers need to confirm the location of survival equipment; ratings are shown only during drills

D. Immediately, as part of the mandatory familiarisation process before the vessel sails — every seafarer must know exactly where their personal survival equipment is stowed and confirm it fits and is in good condition, not wait for the first scheduled drill

A. Lifejackets should be worn under outer clothing to keep them protected from sea spray

B. Put on warm clothing first if time allows, then the lifejacket over the top (never under clothing), secure all straps including the crotch strap if fitted, and check the light and whistle are attached and functioning

C. Put the lifejacket on first, then add warm clothing over it for extra insulation

D. Only secure the chest strap — leg/crotch straps are optional and rarely needed in practice