What the examiner is probing
The examiner wants to know that you, as Master, understand the UK regulatory publication hierarchy — not just that these documents exist, but which ones carry legal weight, why that distinction matters operationally, and how you keep yourself and your vessel compliant. A watchkeeper-level answer lists the three types. A command-level answer explains their legal character, gives examples relevant to your certificate and vessel, and tells the examiner how you stay current.
The publication hierarchy
Merchant Shipping Notices (MSNs) are the tier with statutory force. They are issued under the Merchant Shipping Acts and associated Regulations. Where an MSN sets a requirement, non-compliance is a legal breach. The underpinning instrument for Master (Yachts) certification is MSN 1858 (currently at Amendment 2), which sets out the standards of competence, qualifying sea service, and approved examination routes. When the examiner asks about your certificate, every requirement you quote flows from MSN 1858.
Marine Guidance Notes (MGNs) do not have statutory force but represent the MCA's interpretation of how the law should be applied, and best-practice guidance. Courts and flag state surveyors regard them as the benchmark for a competent master's conduct. Treating MGN guidance as optional is poor seamanship and, in a prosecution, would count against you.
Marine Information Notes (MINs) are time-limited notices — administrative, procedural, or informational. They cover fee changes, examination arrangements, temporary guidance, and similar matters. MIN 690 (Amendment 6, May 2026) governs the current oral examination process for Officer of the Watch and Master (Yachts) grades. MINs are withdrawn once superseded; you cannot rely on an out-of-date MIN.
Annual Summary of Notices to Mariners
Published by the UKHO, the Annual Summary consolidates the notices that remain in force at the start of each year, specifically those affecting the Admiralty charts and publications you are required to carry. As Master, you use it to confirm that your chart outfit corrections are complete and that your Sailing Directions, List of Lights, and other UKHO publications are still current editions. It also contains important general notices — including those relating to chart carriage, GPS accuracy warnings, and reporting obligations — that have a direct safety bearing.
The summary does not replace weekly Notices to Mariners for chart corrections during the year; it is the year-start baseline.
How to structure your spoken answer
State the three-tier hierarchy and the legal distinction in the first sentence. Then give a concrete example from your own context — MSN 1858 for your certificate; MGN guidance on enclosed spaces or hours of rest; the MIN governing your exam. Mention the Annual Summary as your chart-currency tool. Keep it to four to five sentences; precision signals command standard, not volume.