UK coded vessels are classified into seven Categories — Cat 0 through Cat 6 — based on how far from a safe haven they can operate. Lower numbers = further offshore = more rigorous equipment, stability and crew requirements. Here's what each Category actually means.
The big picture
Categories are an operating envelope. They don't describe what kind of boat you have — they describe how far from shore that boat is allowed to operate commercially. A Cat 2 coding cert means your vessel can operate up to a certain distance from a safe haven in a given sea state. Step outside that envelope and you're operating outside your certification.
The Categories run from Cat 0 (unrestricted ocean voyages) down to Cat 6 (rivers and inland waters only). Most UK charter operations sit between Cat 2 and Cat 5.
Each Category, plain English
Unrestricted
Operating area: Worldwide, no restriction.
Sea state: All conditions.
Typical vessels: Larger commercial yachts, sail training vessels, expedition charter.
Crew: Yachtmaster Ocean or equivalent professional ticket, full STCW.
Equipment threshold: Full SOLAS-aligned set, liferafts for full complement, EPIRB + SART, fire suppression.
Up to 150 nautical miles from a safe haven
Operating area: Open ocean within 150 nm of safe haven.
Sea state: Most conditions, with weather caveats.
Typical vessels: Offshore charter yachts, sail training, ocean delivery.
Crew: Yachtmaster Offshore Commercial minimum, ENG1, STCW Basic.
Equipment threshold: EPIRB + SART, two-VHF DSC, liferaft for full complement, full SOLAS pyrotechnics.
Up to 60 nautical miles from a safe haven
Operating area: Coastal and offshore within 60 nm of safe haven.
Sea state: Moderate. Most weather windows for charter operations sit here.
Typical vessels: Charter yachts, larger RIBs, commercial sailing schools, dive charters.
Crew: Yachtmaster Offshore Commercial, ENG1, STCW Basic, VHF SRC.
Equipment threshold: EPIRB now required (new under SPV Code 2025), SART, two VHF, liferaft, full pyrotechnics pack.
This is the most common Category for UK charter operations on the Antrim coast, the Solent and the Irish Sea.
Up to 20 nautical miles from a safe haven
Operating area: Coastal, within 20 nm of safe haven.
Sea state: Moderate, with weather restrictions.
Typical vessels: Day-charter RIBs, angling charters, smaller charter yachts.
Crew: Yachtmaster Coastal Commercial, ENG1, first aid, VHF SRC.
Equipment threshold: EPIRB now required (new under SPV Code 2025), liferaft, VHF DSC, full pyrotechnics.
Up to 20 nautical miles in favourable conditions, daylight only
Operating area: 20 nm in favourable conditions, day operations only.
Sea state: Favourable to moderate — defined sea state limit.
Typical vessels: Day-tripper boats, dolphin/whale-watching, smaller RIBs operating in summer.
Crew: Yachtmaster Coastal Commercial or equivalent, ENG1, first aid.
Equipment threshold: Liferaft, VHF, simplified pyrotechnics pack, daylight-restricted operating window.
Up to 20 nautical miles, daylight, favourable conditions, smooth/partially-smooth waters
Operating area: Sheltered coastal waters — estuaries, sea lochs, inside headlands.
Sea state: Smooth water (significant wave height limited).
Typical vessels: Sightseeing boats, fjord tours, ferry-like operations in sheltered areas.
Crew: RYA Day Skipper Commercial Endorsement minimum, ENG1, first aid.
Equipment threshold: Lifejackets per person, distress signalling, basic radio, simplified equipment set.
Rivers, lakes, inland waterways
Operating area: Inland waterways only.
Sea state: Inland — no sea state.
Typical vessels: River cruise, canal boats, inland waterway charter.
Crew: Boatmaster Tier 2 or equivalent inland ticket.
Equipment threshold: Inland-water equipment set, no offshore equipment required.
How to pick the right Category for your operation
The temptation is to apply for the highest Category your vessel could possibly meet — gives maximum operating flexibility. The cost: more equipment, more rigorous crew tickets, higher insurance, more frequent inspection. Pragmatic charter operators size their Category to their actual operating area, with a small buffer.
- If 95% of your charters are inside 10 nm: Cat 3 or Cat 4.
- If you genuinely cross to the Mull of Kintyre or out to Rathlin: Cat 2.
- If you do offshore deliveries or sail training that crosses the Irish Sea: Cat 1.
- If you operate on Strangford Lough or Lough Foyle only: Cat 5.
Categories vs jurisdictions vs Codes
These three terms get muddled. Here's the difference:
- Code = which rulebook applies (MCA SPV Code 2025, Workboat Code Ed.3, Irish PBL)
- Category = the operating envelope within a UK Code (Cat 0–6)
- Jurisdiction = which national authority signs off (UK MCA, Irish MSO)
A vessel can be UK MCA Cat 2 under SPV Code 2025 and Irish PBL Class P4 simultaneously. Two certificates, two annual surveys, one vessel. More on Irish PBL Classes here.
What changed under the SPV Code 2025
The Category system itself didn't change — Cat 0 to Cat 6 stays. What changed under the new Sport & Pleasure Vessel Code 2025:
- EPIRB now required for Cat 0–2 (was Cat 0–1)
- Mandatory SMS for charter operations in all Categories
- Standardised single-route stability declaration for under-15m vessels in any Category
- Formal owner declarations across all Categories
One record, every Category, every Code
CodedOK loads the correct schedule per vessel — pick the Category and jurisdiction, the right requirements load automatically. Free to start.
Start free →Independent recordkeeping aid. Always consult your YDSA or MCA-recognised surveyor on Category-specific questions for your vessel.