Shipping
- Information from the UK Department for Transport on maritime regulation and safety matters.
- http://www.dft.gov.uk/pgr/shippingports/shipping/

DEFRA Environmental Protection: Marine
- Information on the Department for Environment Food and Rural Affairs activities co-ordinating marine environment policy.
- http://www.defra.gov.uk/environment/water/marine/uk/policy/index.htm

Caledonian MacBrayne Ferries
- Hebridean and Clyde ferry services. Company information, route information, and online booking.
- http://www.calmac.co.uk/

Marine Accident Investigation Branch
- Provides information on the work of the MAIB, which is responsible for investigating all types of marine accidents, both to ships and to people on board them.
- http://www.maib.dft.gov.uk/

Trinity House Lighthouse Service
- Responsible for operating and maintaining the country's lighthouses.
- http://www.trinityhouse.co.uk/

Maritime and Coastguard Agency
- Information on maritime matters, Merchant Shipping Notices, Marine Guidance Notes and Marine Information Notes.
- http://www.mcga.gov.uk/

Her Majesty's Nautical Almanac Office
- Produces the Astronomical Almanac, the Nautical Almanac, Astronomical Phenomena, the Star Almanac and the UK Air Almanac.
- http://www.nao.rl.ac.uk/