Prepare for the MCA OOW by practising sequenced spoken decisions: classify each encounter, fix your own status under Rules 12 to 18, state your action and signals, then state your response if the other vessel fails to comply. Switch entirely to the Rule 19 regime when vessels are not in sight of one another, and rehearse watch handover briefings with the same discipline.
Separating rule recitation from spoken decision sequencing
The oral-style OOW assessment rewards sequenced decision-making: classify the encounter, fix your status, state your action, then state your response if the other vessel does not act.
Reciting that a crossing vessel on your starboard side is the give-way vessel is declarative knowledge. The harder skill is procedural: naming the rule, stating what you are doing, what signal you sound, and what you do next if she does nothing. A candidate can quote Rule 15 accurately yet freeze when asked what happens at four miles with no response from the other ship.
Practise a four-step narration for every encounter you draw or imagine. Step one, classify the encounter and cite the governing rule. Step two, state your own status and obligation. Step three, state your action, the signal, and how Rule 8's requirements for early, substantial and readily apparent action shape it. Step four, state your staged response to non-compliance. Recording yourself makes the stumbles visible in a way silent reading never does.
Establishing give-way and stand-on status under Rules 12 to 18
Work through the hierarchy in order: check overtaking first, then the power-driven categories under Rules 14, 15 and 18, then sailing vessel pairs under Rule 12, adjusting for Rule 18 exceptions.
Rule 13 comes first because overtaking applies to any vessel overtaking, overriding the power-driven and sailing rules that follow. Establish what an overtaking vessel is: approaching from a direction more than 22.5 degrees abaft the other's beam, so that at night only her sternlight would be visible. If you cannot determine whether you are overtaking or crossing, Rule 13(c) tells you to assume you are overtaking and act accordingly.
Only after dismissing overtaking do the power-driven categories apply: Rule 14 head-on, Rule 15 crossing, then the Rule 18 priority order among vessel types such as vessels not under command, restricted in ability to manoeuvre, constrained by draught, fishing, sailing and power-driven. Build flashcard pairs that present two vessels plus their status flags, and force yourself to answer with a rule number and a status before anything else. Status first, action second, is the habit worth drilling.
Acting in stages when the give-way vessel fails to comply
Rule 17 works in stages: hold course initially, then act under 17(a)(ii) if the give-way vessel fails to act, and act decisively under 17(b) when collision cannot be avoided by her action alone.
Rule 17 gives the stand-on vessel a graduated duty, not a passive one. Under 17(a)(i) you keep course and speed while the give-way vessel acts. Under 17(a)(ii), once it becomes apparent she is not taking appropriate action, you may take action to avoid collision. Under 17(b), when collision cannot be avoided by the give-way vessel's action alone, you must take the action that will best aid to avoid collision. Rule 17(c) then restricts one specific manoeuvre: a power-driven vessel taking action under 17(a)(ii) shall not alter course to port for a vessel on her own port side.
Worked scenario: your vessel makes 12 knots; a power-driven vessel crosses from starboard, her bearing steady, range closing from 6 to 4 miles, predicted CPA under 0.3 miles, and she shows no response. The common mistake is holding course and speed to the last moment, then making a small late alteration. The better decision is to treat 17(a)(ii) as engaged: sound one short blast for a starboard alteration under Rule 34, make a substantial course change that produces a clear CPA, and do not resume your original course until finally past and clear. Note that a starboard alteration is not the 17(c) restriction; that prohibition applies to altering to port for a vessel on your own port side. It matters because late, small alterations violate the early-and-substantial standard in Rule 16 and can be misread by the other bridge, and because quoting the wrong subparagraph in an oral-style assessment is itself an error.
Switching between Rule 19 and Rules 11 to 18 in restricted visibility
Rule 19 replaces the give-way and stand-on structure entirely when vessels are not in sight of one another; every vessel must take avoiding action on its own behalf.
The regime shift is the concept to master. Rules 11 to 18 govern vessels in sight of one another and create stand-on and give-way roles. Rule 19 governs vessels in or near an area of restricted visibility where those roles do not exist, so there is no stand-on vessel and you cannot await anyone else's action. Rule 19(b) requires proceeding at a safe speed adapted to the circumstances, and Rule 19(c) restricts your alterations: avoid altering to port for a vessel forward of the beam, other than one you detect overtaking, and avoid altering towards a vessel abeam or abaft the beam.
Worked scenario: in fog, your radar shows a target at 030 degrees relative, five miles off, closing with a predicted CPA of zero. The mistake is narrating it as a Rule 15 crossing and labelling the target the give-way vessel; in-sight-of-one-another language has no place here. The better decision is to state the Rule 19 obligations: adjust speed under 19(b), alter to starboard under 19(c)(i) to open the CPA away from a vessel forward of your beam, sound the Rule 35 fog signal, and re-assess the picture. It matters because the permissible and forbidden alterations differ completely between the two regimes.
The table below fixes the contrast in one view so the switch becomes automatic when a scenario changes visibility.
| Aspect | Rules 11 to 18 (in sight of one another) | Rule 19 (restricted visibility) |
|---|---|---|
| Stand-on vessel | Exists; defined by Rules 12 to 18 | None; every vessel acts on its own behalf |
| Trigger for duty | Visual sighting of the other vessel | Detection by radar alone or other means, not in sight |
| Alteration forward of the beam | Governed by the give-way and stand-on roles and Rule 17 | Avoid altering to port except for an overtaking vessel |
| Speed | Rule 6 safe speed in all conditions | Rule 19(b) safe speed adapted to visibility and radar; may require reduction or stopping |
| Sound signals | Rule 34 manoeuvring signals when altering course | Rule 35 sound signals for restricted visibility |
Briefing a safe watch handover during live traffic
A handover is safe when the relieving officer can state the traffic picture, the passage plan position, the steering mode and the master call criteria before accepting the watch.
Watchkeeping under the ship's safety management system is assessed through your ability to describe the mechanics, not just the rules of the road. A handover briefing should cover the vessel's position against the passage plan, course and speed, the steering mode and any change planned, weather and visibility outlook, the traffic picture including any CPA concerns, and the specific circumstances that require calling the master. Deck log accuracy during the watch belongs to the same habit: events recorded as they happen, not reconstructed afterwards.
Mini scenario: you arrive to relieve the watch while an overtaking situation is resolving two miles ahead. The mistake is a casual acceptance because nothing dramatic is happening. The better decision is to postpone the formal handover until the situation is finally past and clear, use the interval to observe and brief, then confirm you have the watch with a shared statement of the traffic picture and the plan. Handing over in the middle of an unfolding encounter means the officer with the freshest picture walks off the bridge.
A spoken-encounter exercise with a self-check rubric
Build six drawn encounters, narrate the four-step sequence aloud for each, then score the recording against a rubric covering status, action, signals and the second-order response.
Draw or write six encounter cards: a head-on, a crossing from each side, an overtaking, a sailing vessel pair, and one radar-only target in fog. For each card, speak the full four-step narration from section one without notes, and include the correct Rule 34 or Rule 35 signal. The point of speaking aloud is that hesitation marks exactly where your knowledge is procedural rather than verbal, which is the gap that matters here.
Score each narration against five criteria, zero to two points each: classification with the correct rule number; your status stated explicitly; an action that meets Rule 8's early and substantial standard; the correct signal named; and a staged Rule 17 or Rule 19 response to non-compliance. A useful learning milestone, not a pass prediction, is scoring eight or more out of ten on three consecutive cards without notes. Cards that stall should be rebuilt as fresh drawings with reversed geometry so you are not memorising an answer.
An adaptable preparation sequence and readiness checks
Cycle through rule maps, spoken scenarios and handover drills on a self-set timetable, then confirm readiness with concrete performance checks rather than time spent.
A sequence that adapts to whatever time you have: first, rebuild a one-page map of the core duties in Rules 5 to 8, 16 and 17, since everything else hangs on them. Second, drill encounter classification until status comes first in every answer. Third, run Rule 19 switch drills by re-narrating your sighted scenarios as fog scenarios. Fourth, rehearse handover briefings and log entries aloud. Fifth, mix cards randomly under time pressure.
Readiness checks to finish on: you can narrate all six card types without notes; you can state the Rule 17 stages and the Rule 17(c) prohibition on a power-driven vessel altering to port for a vessel on her own port side from memory; you can flip a sighted scenario into a Rule 19 narration in one sentence; you can brief a full watch handover in under a minute without a prompt sheet; and you can explain when Rule 2's special-circumstances duty would modify a standard answer. Administrative matters such as current eligibility and scheduling sit with the MCA, whose guidance is published on GOV.UK; confirm those details there rather than from secondary summaries.
- Phase 1: one-page map of Rules 5, 6, 7, 8, 16 and 17, recited before any scenario work
- Phase 2: encounter cards by category until status identification is immediate
- Phase 3: re-narrate sighted scenarios as Rule 19 fog scenarios to drill the regime switch
- Phase 4: spoken handover briefings plus deck log entries described step by step
- Phase 5: shuffled cards under time pressure, scored against the rubric from the previous section
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.