Marine First Aid: The Essential Kit and Skills for Offshore Sailors

The ocean changes your relationship with medicine. On land, the decision between managing something yourself and going to a doctor is a question of convenience. Offshore, that decision is a question of days, vessel speed, and weather windows.

Every offshore sailor should have basic Wilderness First Aid or equivalent training. This guide covers the kit and the most common scenarios, but it doesn't substitute for hands-on training.

The Marine Medical Kit: What's Different from Land

Scale for the duration of your passage. A weekend bay sail and an Atlantic crossing require different kits. This guide is for offshore passages (7+ days from port).

Drug storage in a marine environment. Humidity destroys pills and degrades injectable medications faster than on land. Store medications in waterproof containers with silica gel desiccant. Know the storage temperatures for critical medications (epinephrine degrades in heat—keep it out of direct sun).

What happens when a crew member is incapacitated? A cruising couple 300 miles offshore with one person down means one person is now boat handler, navigator, cook, and caregiver simultaneously. The fit crew member needs to know how to manage the situation alone.

Tier 1: The Core Kit

Wound care:

• Irrigation syringe (60ml) and 1-liter saline
• Hemostatic gauze (QuikClot)
• Steri-Strips, skin stapler, and suture kit (with instructions)
• Wound closure tape (Steri-Drape or equivalent)
• Large absorbent dressings and elastic wraps
• Nitrile gloves (minimum 10 pairs)
• SAM splints (2)

Critical medications:

• Epinephrine auto-injector (EpiPen): anaphylaxis is life-threatening and can happen from marine creature stings
• Oral antibiotics: amoxicillin-clavulanate (Augmentin) for most soft tissue infections; ciprofloxacin for GI infections
• Prescription pain management: discuss with your physician before departure
• Antidiarrheal: loperamide (Imodium)—dehydration from GI illness is a serious risk offshore
• Antiemetic: promethazine suppositories (prescriptions required in US) or ondansetron (Zofran) ODT

Seasickness medications (multiple protocols):

• Scopolamine patches (Transderm Scop)
• Promethazine suppositories (best for severe cases—works when oral medications won't stay down)
• Meclizine (Bonine): OTC, less sedating than dimenhydrinate

Dental:

• Dental Medic emergency kit or Cavit
• Oil of cloves (temporary dental pain relief)
• Dental mirror and light

The Most Common Offshore Medical Emergencies

1. Seasickness (Very Common)

Not trivial. Severe seasickness leads to dehydration, electrolyte imbalance, and crew incapacitation. Management:

• Initiate medication before symptoms are severe (preventative use is more effective than treatment)
• Hydrate aggressively; small sips frequently beat large quantities infrequently
• Get on deck in fresh air; watch the horizon
• Assign minimal helm watches and heavy sleep time
• If oral medications won't stay down, use suppository or patch

2. Fishhook Injuries (Common)

Fishhooks that penetrate beyond the barb cannot be pulled out—trying to do so creates larger wounds.

String-yank method: Loop monofilament around the bend of the hook. Press the hook shank down to disengage the barb. Sharp yank parallel to the skin surface. Works on many hooks not embedded too deeply.

Push-through method: Push the point and barb through the skin until they emerge, cut the barb with wire cutters, withdraw the hook. Requires sterile technique. Irrigate thoroughly; antibiotics appropriate given marine water contamination.

3. Jellyfish and Marine Stings

Remove visible tentacles with tweezers or gloved hands (do not rub—activates unfired nematocysts). Rinse with seawater (not fresh water, which causes nematocysts to fire). Apply heat (45°C hot water or hot pack) for most marine stings—heat denatures the venom. Vinegar is appropriate for box jellyfish only.

Monitor for systemic reaction (hives, difficulty breathing, dizziness)—this indicates anaphylaxis. Use epinephrine and evacuate.

4. Drowning Near-Incident / Man Overboard Recovery

A recovered MOB victim may appear fine but has often aspirated water. Secondary drowning (delayed pulmonary edema) can manifest 4–8 hours after the event. Any MOB who was in the water more than a minute needs monitoring:

• Take vitals every 30 minutes for 6–8 hours
• Watch for: coughing, shortness of breath at rest, rapid breathing, low oxygen saturation
• If any of these develop: supplemental oxygen if available; maintain upright position; emergency evacuation if possible

5. Offshore Trauma (Rope Burns, Falls, Rigging Injuries)

Rope burns from running lines are painful but rarely serious if treated promptly. Clean with irrigation, apply non-adherent dressing, change dressing daily.

Winch handle injuries and boom strikes can cause serious head, chest, and extremity trauma. Apply trauma protocols: airway, breathing, circulation; stabilize the patient; keep them warm; assess for internal injury (abdominal rigidity, distended abdomen, obvious deformity).

HAVEN Sailing Mode for Medical Management

HAVEN's Sailing mode has offline protocols for all marine medical scenarios. Ask the AI:

• "My crew member recovered from MOB 3 hours ago. What are the secondary drowning warning signs?"
• "I have a fishhook embedded past the barb in my thumb—what's the removal protocol?"
• "My crew has been vomiting for 8 hours and can't keep water down. How do I calculate their dehydration risk?"
• "What's the dose for oral amoxicillin-clavulanate for a suspected wound infection in a 170-pound adult?"

The wilderness medicine library in Sanctuary covers marine-specific conditions in detail. HAVEN's Sailing mode runs completely offline—download your ocean region before departure.