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OpenSeaMap - The free nautical chart

Open nautical chart map built on collaborative maritime data for ports, aids to navigation, and coastal context.

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Official docs ↗

Platforms: Web · Last verified September 7, 2026

Open nautical chart map built on collaborative maritime data for ports, aids to navigation, and coastal context.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

Best for: Nautical geolocation and maritime infrastructure mapping. See the official site linked above for details.