Others we use:
Greenwichmeantime.com
Harwell self-drive angling charters
Hayling Sea School
powerboatdeliveries.co.uk
Weather and Tide:
Met Office
Inshore Waters Forecast
Shipping Forecast
EasyTide
Organizations:
British Marine Federation
Hydrographic Office
Maritime and Coastguard Agency
ofcom
Royal National Lifeboat Institution
Royal Yachting Association
Trinity House