One crew member seems confused and is struggling to answer simple questions clearly. What should happen?

A. Give them a strong coffee and assume that will be enough to clear their head

B. Let them sleep it off in the fresh air without telling anyone

C. Wait until morning to see if they feel better before calling anyone

D. Call for medical help straight away — confusion is a sign of more serious CO poisoning and needs proper medical assessment. Call 999/112 ashore or the Coastguard if afloat, and explain clearly that carbon monoxide exposure is suspected

A. Carbon monoxide (CO) poisoning from engine exhaust fumes — CO is invisible and has no smell, so headache, drowsiness, and feeling sick with no other obvious cause, especially with an engine running nearby, should always raise this possibility immediately

B. Seasickness, even though the boat is moored still in harbour and not moving

C. A normal reaction to being in a small cabin and not worth investigating

D. Simple tiredness from a long day — nothing further needs to be considered

A. Wait a few minutes to see if the headache passes on its own before doing anything

B. Turn off the engine immediately and get everyone out into fresh air on deck straight away — stopping the source and getting clean air to the casualties matters more than anything else in the first moments

C. Move the affected crew to a different part of the cabin, away from fresh air, to rest quietly

D. Open a small hatch slightly but keep the engine running, since it is needed for the battery charge