What do the UNCLOS provisions say about a ship's flag and nationality, what are the duties of flag States, and how are those duties enforced?
Short answer
| Point | UNCLOS article |
|---|---|
| Nationality, registration and a genuine link | 91 |
| One flag only; flags of convenience may mean no nationality | 92 |
| Flag State: effective jurisdiction and control | 94 |
| Pollution rules enforced wherever a violation occurs | 211(2), 217 |
| Port State may stop an unseaworthy ship sailing | 218-219 |
| A lax flag loses the right to pre-empt foreign proceedings | 228 |
| Only the flag State applies for prompt release (ITLOS) | 292 |
- A ship has the nationality of the State whose flag it is entitled to fly, and there must be a genuine link between the State and the ship.
- One flag, one law: no change of flag on a voyage except on a real transfer. A ship using flags by convenience may be treated as stateless.
- Flag State duty: effectively exercise jurisdiction and control in administrative, technical and social matters, conforming to generally accepted international regulations.
- Pollution: the flag enforces its rules irrespective of where a violation occurs, with penalties adequate in severity.
- Enforcement layers: the flag’s own surveys and certificates, ROs under oversight, reports by other States, port and coastal State control, and the IMO Member State Audit Scheme against the III Code (A.1070(28)).
- As Chief Engineer: keep the machinery in the condition the certificates describe. A detention abroad will be investigated by the flag and must be corrected at once.
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class I section of the Marine One forum, open to members enrolled for the MEO Class I exam.