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The Ultimate Guide to UK MCA MSN, MGN, and MIN Notices

Capt. P. Nair | 25 May 2026 | 6 min read
The Ultimate Guide to UK MCA MSN, MGN, and MIN Notices
Orion Maritime Coaching — Expert Faculty Insights

One of the easiest ways to fail your UK MCA oral exam is showing lack of awareness of Merchant Shipping Notices (MSNs), Marine Guidance Notes (MGNs), and Marine Information Notes (MINs). Examiners expect candidates to know the current operational mandates.

Understanding the Hierarchy

  • MSNs (Merchant Shipping Notices): These convey mandatory legal requirements under UK law. Ignoring these can result in direct prosecution or vessel detention.
  • MGNs (Marine Guidance Notes): These provide advice and guidance on safety, pollution prevention, and operational procedures. Though technically recommendations, examiners treat them as best practices.
  • MINs (Marine Information Notes): These contain temporary administrative or operational information, usually valid for a limited period (e.g., exam syllabus updates).

Crucial M-Notices for Orals

Ensure you are thoroughly familiar with MGN 539 (Crucial guidance on lookouts and collision avoidance), MGN 364 (Navigation in restricted visibility), and the latest updates to safety management system guidelines.

Capt. P. Nair
Active sailing officer & expert oral examiner coach at Orion Maritime Coaching. Decades of deep-sea experience across international trade routes.
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