Lesson previewPlan Capacity for the Actual Operation1 section shown
Preview lesson
Plan Capacity for the Actual Operation
What you will learn
Convert a roster into an operation-specific capacity plan covering normal work, peak workload, emergencies, relief, supervision and a credible loss of one person.
Correct manning is not a headcount exercise: the vessel needs enough trained, current and supported people to do the real work without creating excessive hours or a hidden single point of failure.
The RYA publishes correct manning as a core PPR topic. The current Sport or Pleasure Vessel Code sets minimum manning and qualification requirements for vessels in its scope, but it also states that a certificate alone is not evidence of ability to serve in a particular rank on a specific vessel. The owner or operator must provide sufficient trained personnel for the nature and duration of the voyage. Other codes, certificates and local requirements can apply to different operations.
Start with demand, not names. Map departure and arrival, navigation, lookout, passenger supervision, machinery, communications, routine work, rest, and credible emergencies. Then show who can perform and supervise each role, who can take over, and what happens if a person becomes unavailable. One highly qualified skipper shown against every critical task is a capacity warning, not a complete plan.
A minimum table is a legal or code input, not a guarantee of safe capacity in today's conditions. This lesson cannot determine the applicable regime, required complement, competence, medical fitness, rest compliance or whether a real operation may proceed. Those decisions require current certificates, law, code, operator controls and competent authority and command judgement.
Crew-capacity decision drill
Remap the operation when people or evidence change
Select a constructed case and trace demand, people, capability, rest, welfare and the owned next state. The drill teaches questions and boundaries; it does not produce an operating approval.
Early start after late travel
The published roster meets the intended number, but the skipper and deck crew arrive after disrupted late travel for an early passenger departure.
- 1Demand
- 2Available people
- 3Capability evidence
- 4Work/rest or fitness evidence
- 5Welfare/communication
- 6Controlled next state
- Demand
- Departure, close-quarters control, lookout, lines, passenger supervision and later recovery coverage overlap
- Available people
- The named people are present, but presence does not prove that each required function is currently supported
- Capability evidence
- Check role eligibility, demonstrated task ability, vessel familiarity, supervision and a capable backup
- Work/rest or fitness evidence
- Use actual work, travel, rest opportunity and observable or reported capability through the applicable process; do not diagnose
- Welfare/communication
- Provide a private route to report concern and remove pressure to declare readiness for the schedule
- Controlled next state
- The operator and master route verifies capacity and changes staffing, workload, timing, route or continuation if evidence is unsupported
Supported next state
The roster becomes a fresh capacity decision using actual evidence before the busiest stage begins.
Authority boundary
This case cannot prescribe rest, assess fitness or competence, set a legal complement or approve the departure.
Constructed revision cases only; the board cannot set a complement, diagnose fitness, approve a roster or decide whether a real vessel may sail.
Worked example
A skipper and one deck crew are planned for a four-hour passenger trip. The busiest stages require close-quarters control, lookout, lines and passenger supervision, and the recovery plan assumes two capable people besides the person in the water.
- 1List simultaneous demand at departure and arrival rather than averaging the work across the whole trip.
- 2Map each role to demonstrated current competence and vessel familiarity; do not count passengers or trainees as safety-critical crew unless the real framework permits it.
- 3Test the failure case: if the deck crew is injured or incapacitated, identify which lookout, passenger and recovery functions become unsupported.
- 4Route the gap before departure through the operator and master decision: add suitable capacity, change the operation, delay or cancel rather than writing the same person into overlapping boxes.
Sense check: If the plan works only while every person performs every task perfectly, it has described an ideal outcome rather than safe capacity.
| Demand state | Evidence to name | Weak substitute |
|---|---|---|
| Normal work | Navigation, lookout, machinery, passengers and routine tasks | Two crew |
| Peak workload | Concurrent departure, arrival, lines, communications and supervision | We manage |
| Recovery or emergency | Qualified control, lookout, communications, recovery and passenger control | The skipper does it |
| Relief and rest | Who can genuinely take over each duty and for how long | Take turns |
| Loss of one person | Functions that remain supported and the decision trigger | Someone else helps |
Make the task map before choosing the number
For one planned trip, expose the points where work is simultaneous or where one person's loss changes the operation.
1. Demand
Name normal, peak and emergency tasks with their timing and conditions.
2. Capacity
Name competent primary, backup and supervising roles plus real rest coverage.
3. Decision
Record the unsupported function, owner and alter, delay or stop route before departure.
Sense check: A plan that says only 'minimum crew met' cannot show whether concurrent work, relief or recovery remains credible.
Common mistake or limitation
- Treating a minimum complement or valid certificate as proof that the actual operation is safely supported.
- Counting one person against simultaneous lookout, control, passenger and emergency roles.
- Assuming this classroom task map identifies the applicable code or approves a real manning arrangement.
Recap
- Start with the vessel, operation, duration, conditions and people actually carried.
- Map normal, peak, emergency, relief and person-loss demand.
- A certificate is necessary evidence in many regimes but not proof of vessel-specific capability.
- Unsupported capacity changes the plan through the real authority route.
Optional quick check
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