24 February 2025
by Adam JamesNew maritime guidance warns of alcohol and drug risks at sea
The UK Maritime and Coastguard Agency (MCA) has issued updated guidance, MGN 193 Amendment 2 (M+F), emphasising the dangers of alcohol and drug use in survival situations at sea.
The notice highlights that alcohol accelerates body cooling, increasing the risk of hypothermia, particularly in cold-water exposure. Even moderate alcohol consumption can lead to hypoglycaemia (low blood sugar), further impairing the body’s ability to retain heat. The guidance warns that blood alcohol levels above 80 mg per 100 ml—the legal drink-driving limit—pose a significant threat to survival.
Additionally, the guidance outlines the dangers of drug abuse, noting that substances like barbiturates, morphine, cannabis, and ecstasy can impair mental faculties and physical responses, further reducing the chances of survival in emergencies.
The MCA advises that all alcohol and drug use should be strictly avoided when there is any risk of cold exposure at sea. The full guidance is available on the MCA’s official website: MGN 193 Amendment 2 (M+F) the effects of alcohol or drugs at sea - GOV.UK
British marine members can obtain guidance and advice by emailing technical@britishmarine.co.uk