Module 14 - Passage Planning
The Importance of Passage Planning
What you will learn
Use appraisal, planning, execution and monitoring as one proportionate decision cycle for an extended coastal passage, rather than treating the written route as a promise to depart.
A useful passage plan is a berth-to-berth safety process. Its detail fits the vessel, crew and trip, exposes assumptions and preserves a safe change of plan before choices close.
SOLAS V Regulation 34 requires an intended voyage to be planned with appropriate charts and publications before proceeding to sea. RYA guidance explains that even a short or familiar trip needs an element of planning, while MCA guidance says the degree of detail for a small vessel depends on the vessel, crew and length of voyage. Proportionate does not mean casual: exposure, tide, darkness, crew capability and consequences determine the work required.
IMO voyage-planning guidance describes appraisal, planning, execution and monitoring, often remembered as APEM. Appraisal gathers and tests the evidence. Planning turns it into a berth-to-berth route, limits and alternatives. Execution uses the current plan. Monitoring compares reality with the assumptions and triggers a change while a safer option remains available.
APEM is a structure, not a guarantee that nothing has been overlooked. Forecasts change, electronic data can mislead, equipment fails, people tire and timings slip. Coastal-level judgement names the critical assumptions, margins, decision points and alternatives, then keeps the people aboard working from the same current plan.
| Component | Controlling question | Useful output |
|---|---|---|
| Appraise | What evidence and limitations govern this trip? | Current sources, hazards, vessel and crew limits |
| Plan | How will the complete trip be made and checked? | Route, timing, margin, triggers and alternatives |
| Execute | Do the assumptions still hold as the trip begins and changes? | A briefed current plan with recorded amendments |
| Monitor | Is reality still inside the accepted limits? | Evidence tied to continue, hold, shorten or divert decisions |
Frame one demanding passage
A fictional 72 NM training passage includes an exposed headland, an overnight leg, five crew of mixed experience and a destination tidal gate. The forecast may increase before arrival.
1. Appraise
Check current route, tide, forecast, vessel condition, usable fuel, crew capability, refuge and legal requirements.
2. Plan
Build the whole route with realistic timings, independent checks, watch roles, margins, decision points and alternatives.
3. Execute
Reconfirm the assumptions before departure, brief the crew and record material changes to the working plan.
4. Monitor
Compare position, ETA, conditions, vessel and crew with the plan, then act before the refuge or arrival margin closes.
Sense check: A detailed route can still be unsafe if it hides an exhausted crew, optimistic speed or an unusable alternative.
Common mistake or limitation
- Treating APEM as a checklist that guarantees completeness instead of a cycle driven by current evidence and judgement.
- Assuming that familiar water or a plotted electronic route removes the need for a proportionate berth-to-berth plan.
- Treating departure or the original destination as success, even after the assumptions that supported them have failed.
Recap
- Plan every trip in proportion to the vessel, crew, route and conditions.
- Appraisal, planning, execution and monitoring form one continuing cycle.
- A useful plan exposes assumptions and preserves choices; it does not guarantee the outcome.
Optional quick check
Section 1 of 10
Which statement best describes APEM for an extended coastal passage?
Sources and factual review
Reviewed 2 September 2026 - Compass Revision editorial review.
Continue studying Passage Planning
This public lesson is part of Revision Module 14. Full revision access adds the guided Learn, Practise and Test flow, flashcards and revision progress.