Government
- The Alaska Division of Fish & Wildlife Protection
- The Argentine Maritime Authority
- The Auckland Police Maritime Unit
- The Australian Shipping Registration Index
- British Waterways Home Page (Agency in charge of Britain's canals)
- The California Department of Boating and Waterways
- The Canadian Department of Fisheries and Oceans
- The Canadian Hydrographic Service
- The Clark County Sheriff's Office Marine Patrol (Washington)
- El Govern Balear
- Falkland Islands Government
- The Finnish Maritime Administration
- The Florida Fish and Wildlife Conservation Commission
- Georgia Fishing and Boating Permits Online
- The Hong Kong Marine Department
- The Hong Kong Shipping Register Index
- Intergovernmental Oceanographic Commission (Of UNESCO)
- International Council for the Exploration of the Sea
International Maritime Organization (International)
- Marine Accident Investigation Branch (UK)
- The National Vessel Documentation Information Center
- The NOAA's National Marine Sanctuary Program
- OceansCanada (Comprehensive guide to everything oceans)
- The Ohio Department of Natural Resources Division of Watercraft
- The Oregon Department of Fish and Wildlife
- The Oregon State Marine Board
- The Pennsylvania Fish & Boat Commission (PFBC)
- Service Hydrographique et Océanographique de la Marine
- The Transportation Safety Board of Canada (Incident reports, more)
- The UK Department for Transport, Local Government and the Regions
- The United States Army Corps of Engineers Information Network
- The US Army Corps of Engineers Inland River Home Page
- The US Army Corps of Engineers Portland, Oregon District
- The US Army Office of the Chief of Transportation
- US Maritime Administration
- The US Transportation Command
- US Vessel Documentation Information by ID Number
- US Vessel Documentation Information by Name