Internet
Map Locator: 
- NOS Mapfinder
- NOS Nautical charting
- NOS Bathymetric and Fishing maps information
- IHO Data Center for Digital Bathymetry
- USGS National Mapping Information
- NIMA National Imagery and Mapping Agency
- USGS Online Map List
- USGS Map Dealer
- Geological Map Series for the UK
- NOAA Historical Map and Chart Collection
- Maptech (digital charts)
- Pilot Atlases
- World Maps from Omni Rsources
- SOFTCHART (digital chart and map products)
- Baldwin Map Shack
- Wide World of maps
- Library of Congress Maps Collection 1544-1499
- David Rumsey Collection
- Global Maritime Boundaries Database
