Category 3:
Craft categories – Max length 60ft – Narrowboats 75ft Craft description:
Craft over 17 knots based and used on UK inland or coastal waters up to 12 nautical miles from the UK coast.
OR
Any craft to be used on inland and coastal waters of the UK and Eire, and inland waters of EU member countries Extended under Category 3 only to any craft navigating within the limits of 54* North and 46* North and not beyond 10* West.

Coastal waters of the UK and Eire being up to 12 nautical miles of the coast (including the extent of the Irish Sea and North Channel)