Lesson previewWhen to Ask: Cross the Onboard Limit1 section shown
Preview lesson
When to Ask: Cross the Onboard Limit
What you will learn
Recognise when illness, injury, uncertainty or the boat's limits require early professional medical advice without waiting for a diagnosis or complete deterioration.
The UK telemedical route begins with HM Coastguard. Call when the casualty or the boat has crossed the limit of safe onboard care, then let observed urgency—not embarrassment or a guessed diagnosis—control the priority.
MCA MGN 623 says a UK skipper seeking telemedical advice should first contact HM Coastguard, which can connect the vessel to a designated Telemedical Advice Service doctor. The service supplements the crew's first-aid training and written medical guidance; it does not turn a skipper into a clinician or postpone care already within current training.
Call early when the condition is serious, worsening or unclear; when repeated observation is difficult; when a necessary medicine, procedure or evacuation decision is beyond the crew; or when distance, weather, crew capacity and landing access are shrinking safer options. A familiar label such as seasickness, a calm casualty or a temporarily controlled symptom does not by itself prove that advice can wait.
Priority and medical advice are separate decisions. Grave and imminent danger requiring immediate assistance is distress. Concern for the safety of a person or vessel that is not distress can justify urgency. A less acute request still goes through the effective Coastguard route. This lesson cannot classify a real casualty: if the picture is doubtful, give the observed facts promptly and follow Coastguard instructions.
Medical-advice call board
Protect, locate, call, brief and keep updating
Select a situation to rehearse how casualty care, vessel control, position, call priority, useful medical evidence and fallback stay connected. Every state is complete in text and does not depend on colour.
- 1Protect + roles
- 2Position + urgency
- 3Opening
- 4Medical facts
- 5Read-back + update
- 6Handover / fallback
The stages can overlap. Immediate first aid and safe vessel control do not wait for a complete note, diagnosis or flawless radio script.
1 · Protect + roles
Continue trained first aid, keep the vessel safe and assign separate casualty, helm or lookout, radio and written-record roles where the crew allows.
2 · Position + urgency
Prepare the current supported position, observation time, source and uncertainty. Seriousness, uncertainty and narrowing landing options can justify early advice before distress develops.
3 · Opening
Contact HM Coastguard through an effective available route. If urgency is justified, use the PAN PAN procedure taught in recognised radio training and state that medical advice is required.
4 · Medical facts
Give observed response and breathing, symptoms or injury, onset and trend, treatment, medicines, allergies, relevant history, crew limits and the nearest practical landing options. Do not invent a diagnosis.
5 · Read-back + update
Write and read back names, numbers, medicines, instructions, the agreed plan and the changes that require another call. Assign each action to a named crew role.
6 · Handover / fallback
Keep the casualty under observation and preserve the full time line for the doctor, Coastguard or later receiving team. Advice does not by itself mean evacuation has been ordered.
Choose a situation and rehearse how boat control, call priority, casualty evidence, updates and fallback remain connected without diagnosing or operating a real radio.
Worked example
A casualty remains awake after a fall, but pain is increasing, the cause is uncertain and the yacht is ninety minutes from the nearest practical landing place.
- 1The crew continues trained first aid, assigns one person to the casualty and keeps the vessel under control.
- 2The radio operator prepares present position, incident time, observed response and breathing, pain trend, injuries seen, treatment, medicines, allergies and the landing options.
- 3The skipper contacts HM Coastguard early and states the uncertainty and access limit rather than waiting for a confident diagnosis.
Sense check: The call is justified by the seriousness, uncertainty and shrinking access margin; it does not require the skipper to name the injury.
| Observed boundary | Why advice is useful now | Unsafe delay |
|---|---|---|
| Serious, worsening or uncertain condition | A doctor can help frame care and disposition through HM Coastguard | Wait until a diagnosis is obvious |
| Care or medicine beyond current training | The adviser can work from the exact onboard limits | Improvise a procedure or dose |
| Remote position or narrowing weather window | Coastguard can consider landing, rendezvous or evacuation options | Call only after the last easy diversion is passed |
| Reduced crew or unreliable monitoring | The boat context changes what continued observation can support | Treat a stable moment as proof the passage remains safe |
Make the advice decision before the route becomes forced
A two-person crew can either turn towards shelter now or continue offshore while one person watches a casualty.
1. Protect the present
Keep trained care and safe vessel control running while the call is prepared.
2. Expose the limits
State remaining crew, distance, weather, communication and landing constraints with the casualty facts.
3. Preserve options
Call while diversion, rendezvous or continued observation remain genuine choices.
Sense check: Calling early asks for expert input; it does not automatically commit the vessel to evacuation.
Common mistake or limitation
- Waiting for a diagnosis, collapse or uncontrolled symptom before requesting advice.
- Treating a briefly stable observation as proof that a remote passage remains safe.
- Letting embarrassment about a medical problem lower the urgency or omit useful evidence.
Recap
- HM Coastguard is the first UK contact for telemedical advice at sea.
- Seriousness, uncertainty, deterioration and boat limitations can each justify an early call.
- Give observations and constraints; the skipper does not need to diagnose the casualty.
Optional quick check
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