Maintains 2,000 miles of canals and river navigations.

Information on the Department for Environment Food and Rural Affairs activities co-ordinating marine environment policy.

Produces the Astronomical Almanac, the Nautical Almanac, Astronomical Phenomena, the Star Almanac and the UK Air Almanac.

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.

Information on maritime matters, Merchant Shipping Notices, Marine Guidance Notes and Marine Information Notes.

Responsible for operating and maintaining the country's lighthouses.