Maritime

• MCA - Maritime and Coastguard Agency
• Radiocommunications Agency
• RNLI
• RNLI - Nottinghamshire fundraising section
• Royal Navy
• Trinity House (lighthouses)

Nautical

• Afloat
• MarineData Internet - Just about everything you want to know about boats
• PBA - Professional Boatmans Association
• RIBnet
• RYA - Royal Yachting Association