Cold Water and Hypothermia: Staying Safe in the Water
How cold water affects the body, the danger of cold water shock, how to survive immersion, and how to recognise and treat hypothermia after a rescue.
Essential first-aid knowledge for the water: handling common injuries, seasickness, hypothermia and emergencies when professional help may be hours away.
At sea you may be hours from professional medical help, so basic first-aid knowledge is part of being a responsible skipper. Injuries afloat range from minor cuts, sunburn and seasickness to serious problems like severe bleeding, burns and hypothermia. Knowing how to respond calmly and effectively can prevent a manageable situation from becoming a crisis.
This guide is an overview of first-aid basics relevant to boating. It is not a substitute for proper training. If you spend time on the water, a recognised first-aid course, ideally one with a marine focus, is strongly recommended, because there is no substitute for practising these skills with an instructor.
Good first aid starts before you leave the dock. Preparation turns a panic into a plan.
Knowing where the kit is and what it contains means you are not searching for supplies while someone needs help.
Most incidents afloat are minor but still need attention, especially in a marine environment where wounds can worsen quickly.
Small problems left unmanaged can quickly reduce a crew’s ability to handle the boat, so treat them promptly.
For life-threatening situations, a clear priority order helps you act rather than freeze. Assess danger, response, airway, breathing and circulation, and send for help early.
The details of CPR and casualty management are exactly what a hands-on first-aid course teaches, which is why doing one matters so much for anyone going to sea.
The marine environment makes cold injuries a particular risk, especially after someone has been in the water.
Because immersion and cold are common at sea, knowing how to recognise and treat hypothermia is an essential boating skill rather than a niche one.
You are rarely truly alone. Know how to reach the help that exists.
Basic first aid and knowing how to get help are core parts of safe seamanship. The boatingexamine course covers safety and emergency procedures within the wider syllabus, and pairs naturally with a practical first-aid course to make you a genuinely prepared skipper.
Do I need a formal first-aid qualification to go boating? It is not always legally required, but it is strongly recommended. At sea you may be hours from professional help, and practising skills like CPR and casualty care with an instructor is far more effective than reading about them. A marine-focused course is ideal.
How do I get medical help if someone is injured offshore? Use your VHF radio to contact the coastguard, who can connect you with medical professionals for advice and arrange evacuation if needed. Have your position and a clear description of the casualty ready. Use a Pan-Pan for urgent cases and a Mayday when life is in immediate danger.
What are the first signs of hypothermia? Early signs include intense shivering, clumsiness, slurred speech and confusion, progressing to drowsiness as it worsens. Move the person out of the cold, remove wet clothing, insulate and shelter them, warm them gradually, and handle them gently while seeking help.
Structured lessons, realistic mock exams and a step-by-step guide to the exam in your country.
Start free →How cold water affects the body, the danger of cold water shock, how to survive immersion, and how to recognise and treat hypothermia after a rescue.
Learn the recognised distress signals at sea, from flares and radio calls to sound, light and satellite beacons, and how to use each one to attract rescue.
A clear rundown of the safety gear every boat should carry, from lifejackets and flares to fire extinguishers and first-aid kits, and how to keep it ready to use.