Conventions, Certificates and Documents — Getting the Distinctions Right
Examiners probe this area because candidates routinely conflate three distinct things: the international convention that creates an obligation, the statutory certificate that proves compliance, and the onboard document or record that supports ongoing operation. A Master must be clear on all three layers.
Convention → Certificate → Document
Each major convention generates certificates that flag state surveyors issue after inspection, plus operational records the Master maintains throughout the voyage.
| Convention | Key Certificate(s) | Key Operational Record(s) |
|---|---|---|
| SOLAS (various chapters) | Safety Construction, Safety Equipment, Safety Radio, IOPP | Logbook entries, drill records, steering test records |
| MARPOL Annex I | IOPP Certificate | Oil Record Book Part I (≥400 GT) |
| MARPOL Annex VI | IAPP Certificate | BDN (3 years), MARPOL bunker sample (min 12 months or until substantially consumed) |
| ISM (SOLAS Ch IX) | Safety Management Certificate (SMC) | SMS manuals, non-conformity records; Master carries a copy of the DOC |
| MLC 2006 | MLC Certificate / DMLC Parts I & II | Hours of rest records, posted duty table |
The Critical Distinctions
Certificate of Registry vs. Certificate of Competency vs. Statutory Safety Certificate. These are entirely different instruments. The Certificate of Registry establishes the ship's nationality and ownership. A Certificate of Competency establishes the holder's qualification. Statutory safety certificates (e.g., Passenger Ship Safety Certificate, Cargo Ship Safety Construction Certificate) establish that the vessel meets SOLAS structural and equipment standards.
SMC vs. DOC. The SMC is vessel-specific, renewed every 5 years, with intermediate verification between the 2nd and 3rd anniversaries. It must be the original, kept on board. The DOC is company-specific, also on a 5-year cycle with annual verification (±3 months). The Master keeps a copy of the DOC — the original stays with the company.
Statutory certificate vs. operational document. An IOPP Certificate (issued after survey) proves the ship meets Annex I construction and equipment standards. The Oil Record Book (maintained daily by the Master and officers) is the operational record of actual discharges and transfers. A PSC officer will inspect both; a deficiency in one does not automatically affect the other, but discrepancies between them are a serious flag.
BDN vs. MARPOL bunker sample. The Bunker Delivery Note accompanies each delivery and is retained for 3 years. The MARPOL representative sample is a sealed, tamper-evident sample from the same delivery, retained until the fuel is substantially consumed and in any event for a minimum of 12 months — it is the physical evidence available for analysis.
Yacht Code Context
Under MSN 1858 (Amendment 2), large yachts operating commercially under the Red Ensign Group Yacht Code (REG YC Part A, which superseded LY3) carry a blend of statutory certificates issued by MCA-recognised organisations and flag-state documents. The Master must know which certificates are on board, their expiry and intermediate survey dates, and which flag-state authority issued each one — not simply that certificates exist.