COC-REVAL-L4.2

A practical renewal timeline

COC-REVAL-M4 · Records and the renewal timeline · COC-REVAL-M4-A Sea service evidence, testimonials and verification, and a worked timeline that keeps every certificate in step.

Put it all together: **a timeline that starts 18 months before expiry** and ends with every certificate and endorsement in step.

Timeline

Governing: MSN 1861 (M) Amendment 1; MSF 4201 Rev 11/25; MSN 1865 (M) Amendment 1; flag requirements. Builds on: all previous lessons. Cross-refer: Commercial Endorsement: Working Small Craft Commercially.

Worked timeline

Example: Master (Yachts) 3000 GT, CoC expires 31 October 2027, yacht Cayman-flagged, last STCW refreshers completed September 2022, ENG1 expires 15 June 2027, also holds an endorsed Yachtmaster Offshore expiring March 2028.

When Action Why
April 2026 (18 months out) Audit: CoC, refreshers, ENG1, GMDSS, ECDIS, Medical Care, flag endorsements, commercial endorsement. Write the expiry list Nothing surprises you
Winter 2026-27 Book and complete PST, FPFF, PSCRB and AFF refreshers (with onboard self-declarations to shorten PST, PSCRB and AFF) 2022 refreshers lapse in September 2027, before the CoC does
Winter 2026-27 Check Proficiency in Medical Care is within 5 years Needed to command
By early June 2027 Renew ENG1 Expires 15 June 2027; needed for the application and to keep sailing
April 2027 Ask the management company for the Master's service company letter; get any outstanding testimonials verified Masters cannot self-certify
From 30 April 2027 Submit MSF 4201 by email, with GMDSS certificate for synchronisation Window opens 6 months before expiry; new expiry 31 October 2032
On issue Send new CoC to MACI for the Cayman endorsement; update the yacht's crew certificate matrix Endorsement rests on the CoC
Autumn 2027 Revalidate RYA commercial endorsement with 150 days' evidence and a valid medical Separate RYA cycle; do it while documents are to hand

The checklist behind it

Item Rule Source
Sea service 12 months in 5 years, or 3 in 6, or 3 supernumerary MSN 1861 A1 s.3.2
Yacht service Yachts over 15 m; sea, stand-by, yard MSN 1861 A1 s.3.3
Refreshers PST, FPFF, PSCRB, AFF within 5 years MSN 1861 A1 s.2.2(d)
Medical Valid ENG1 or accepted equivalent MSN 1861 A1 s.4
ECDIS / HV Evidence to avoid limitation MSN 1861 A1 s.6
Fee £64 / £74 / £84 by delivery MSF 4201 Rev 11/25
Flag endorsements Update after new CoC Flag's own rules
Commercial endorsement 150 days in 5 years, valid medical RYA

TIP — Share the list Give your expiry list to the yacht's crew administrator. Most management companies track certificates; your list lets them check theirs.

If it goes wrong

Problem Fix
Refresher lapsed Book the refresher; you cannot revalidate or lawfully serve in safety roles until done
Not enough sea service Route B or C, the 30-month occupation route, or the yacht shore-based refresher (MSN 1861 A1 s.9.9)
CoC already expired Standard route may still work if you meet the requirements; otherwise MSF 4258 (Lesson 1.3)
Testimonials unverified Submit to PYA or Nautilus now; allow time
Foreign flag endorsement pending Ask the flag for a temporary document; do not sail without it

CAUTION — Current rules Everything in this course is dated. Before you apply, open the current MSN 1861, MSF 4201 and your flag's latest notice. MSN 1861 Amendment 1 section 2.6 puts the burden on you to meet the requirements in force when you apply.

The habit

Revalidation is not an exam; it is administration. Officers who keep a running sea service log, get testimonials verified on leaving each yacht, and diary every expiry never have a revalidation problem.

Practice questions

5 questions

recall · core

When does the ideal submission window for MSF 4201 open? (a) 2 years before expiry (b) On the expiry date (c) 12 months before expiry (d) 6 months before expiry

recall · core

What must you do with other flags' endorsements after revalidating your UK CoC? (a) Apply for a UK FSE (b) Cancel them (c) Send the new CoC to each flag that has endorsed it (d) Nothing

recall · core

How is the RYA commercial endorsement revalidated? (a) With MSF 4201 (b) Automatically with the CoC (c) Separately with the RYA, on proof of 150 days' sea service in 5 years (d) Never

recall · core

Which refreshers are required for UK CoC revalidation? (a) EFA and PSSR (b) PST, FPFF, PSCRB and AFF (c) Security awareness only (d) MFA only

scenario · core

Captain's CoC expires 31 October 2027; ENG1 expires 15 June 2027; last STCW refreshers were done in September 2022; the yacht is Cayman-flagged. Put the key actions in the right order. (a) Only renew ENG1 (b) Submit MSF 4201 now, refreshers later (c) Book refreshers before September 2027 lapse (early 2027), renew ENG1 before 15 June 2027, get company letter for Master's service, submit MSF 4201 from 30 April 2027, then send new CoC to MACI for the Cayman endorsement (d) Wait until October 2027 then do everything

Independent study. xplor is not an accredited training provider and awards no certificate or Certificate of Competency. Revalidation and flag endorsement decisions are made only by the MCA or the relevant flag administration on the evidence you submit, and requirements must be checked against the current notice and form at the time of application. AI-drafted content pending subject-matter-expert review.