When Must the OOW Call the Master?

Knowing when to call the Master is a fundamental professional skill for any Officer of the Watch. In MCA oral exams, it is a topic examiners probe regularly — not because there is a simple list to memorise, but because the decision to call the Master reflects professional judgement, situational awareness and understanding of both regulations and company procedures.

Why Calling the Master Is a Key Oral Exam Topic

The OOW is responsible for the safe navigation and operation of the vessel during their watch. However, the Master retains overall command and responsibility. The OOW must have the judgement to recognise when a situation exceeds or may exceed the normal scope of the watch — and act on that recognition promptly.

Examiners test this because it goes to the heart of watchkeeping competence. An OOW who calls the Master too late — or not at all — in a developing situation represents a significant safety risk.

Standing Orders and Master's Night Orders

Most vessels operate with written standing orders specifying the conditions under which the OOW must call the Master. These are company and Master-specific, but they almost universally include restricted visibility, navigation equipment failure, doubt about traffic or collision risk, heavy weather concerns, and emergencies of any kind. The OOW must be familiar with the standing orders and comply with them without waiting to decide whether the situation "really" meets the threshold.

Restricted Visibility

Entering or navigating in restricted visibility is one of the most universally cited reasons for calling the Master. Whether visibility deteriorates gradually during a watch or the vessel encounters an unexpected area of fog or poor weather, the OOW should call the Master as the situation develops — not after it has become critical.

Doubt About Traffic or Collision Risk

If the OOW is uncertain about the intentions of another vessel, uncertain about the developing collision avoidance situation, or concerned about the track of any contact, the Master should be called. Rule 7 requires that if there is any doubt about risk of collision, risk shall be deemed to exist. That same principle of caution applies to the decision to call the Master.

Heavy Weather

Deteriorating sea state, increasing wind strength, or conditions that affect the vessel's seakeeping, stability or cargo securing are reasons to call the Master. Standing orders will typically specify wind and sea-state thresholds, but the OOW should also exercise independent judgement when conditions are developing rapidly.

Navigation Equipment Failure

Failure of the radar, GPS, ECDIS, gyrocompass or any critical navigation equipment must be reported to the Master immediately. The OOW should not attempt to navigate around equipment failure without the Master's knowledge and approval. This includes intermittent failures, not just total loss.

Emergencies

Any emergency on board — fire, flooding, man overboard, medical emergency, structural damage, loss of propulsion or steering — requires the Master to be called immediately. The OOW initiates the emergency response, but the Master must be aware and in command as quickly as possible.

Security Concerns

Any security concern — an unidentified vessel behaving suspiciously, a potential piracy or armed robbery threat, a security breach on board — must be reported to the Master and the company security officer without delay.

Uncertainty

If the OOW is uncertain about any aspect of the vessel's safety, position, situation or status, the Master should be called. The OOW should never continue a watch while harbouring unresolved uncertainty about anything that could affect the safety of the vessel, crew, cargo or environment.