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  1. OpenSeaMap - The free nautical chart

  2. Map without labels - Snazzy Maps - Free Styles for Google Maps

  3. OpenStreetMap

  4. Shoreline/Coastline Databases | NCEI - National Oceanic and …

  5. Where do I get real-time coastal conditions? - NOAA's National …

  6. Natural Earth » Blog Archive » Coastline - Free vector and raster map

  7. Map of U.S. Coastlines | U.S. Geological Survey - USGS.gov

  8. Europe Blank Map - Free World Maps

  9. Global Coastline Explorer Home - USGS

  10. Global Coastline Explorer | U.S. Geological Survey - USGS.gov