Why the MAIB Exists — and Why You Must Report
The Marine Accident Investigation Branch exists to improve safety, not to apportion blame. Its legal foundation is the Merchant Shipping (Accident Reporting and Investigation) Regulations 2012 (SI 2012/1743), which implement the EU/IMO framework for independent investigation. The MAIB is entirely separate from the MCA; a report to the MAIB is not a confession to a regulator — but failure to report is a criminal offence under the Regulations.
As Master, the duty to report falls on you. If you are incapacitated, it passes to the owner or operator. Understanding this chain of responsibility matters in the oral because the examiner is testing whether you see yourself as the accountable party.
What Must Be Reported
The Regulations distinguish three categories:
Very Serious Marine Casualty — total loss, loss of life, or severe structural damage. Must be reported to the MAIB immediately (as soon as practicable; in practice, by the fastest available means — telephone first, then written confirmation).
Serious Casualty — significant structural damage, fire, explosion, collision, grounding, contact, capsizing, flooding, or an injury requiring hospitalisation but not loss of life. Report immediately.
Less Serious Casualty / Marine Incident — an occurrence that, under different circumstances, could have become a casualty; includes near-misses that are reportable. These are reported on the MAIB's standard form (Report of an Accident or Incident to a Vessel — Form MCA 8523 or equivalent) within a reasonable time, typically taken as no later than 7 days.
Personal Injury — if a person is incapacitated for more than three days (not counting the day of the accident), a written report is required.
Death on board — always reportable, regardless of cause.
Application on a Superyacht
MSN 1858 defines the certification and manning framework that determines which vessels fall within the UK scheme. As Master of a UK-registered yacht (or a foreign yacht in UK waters where the UK is the flag state or investigation state), you are in scope under the Merchant Shipping (Accident Reporting and Investigation) Regulations 2012.
In practice: after securing safety, your immediate sequence is — telephone the MAIB duty officer (24-hour number, carried in your emergency contacts), preserve evidence (VDR/SVDR data, charts, logs, photographs), and make no repairs that would destroy evidence without MAIB consent. The MAIB may instruct you to hold the vessel.
Crucially: do not conflate MAIB reporting with MCA Port State or casualty reporting obligations — both may apply concurrently.
The Master's Decision
In the oral, the examiner wants to see that you classify the event correctly, report without delay, preserve evidence, and understand that the MAIB investigation is conducted independently of any regulatory action. Your log entries should record what happened and what you reported, and when.