Port Guide & Distances incorporates data compiled from:

• NGA World Port Index (U.S. Government work, Public Domain)
• GEBCO Bathymetric Grid (© IHO–IOC, with attribution)
• Marine Regions EEZ Boundaries (© VLIZ, open data license)
• OpenStreetMap / OpenSeaMap (© OpenStreetMap contributors, ODbL 1.0)
• NOAA ENC (United States) (Public Domain)
• Other publicly available materials and proprietary editorial adjustments.

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