API Documentation

Access marine data programmatically through free and open source APIs.

Tides API

Tide predictions from harmonic constituents for thousands of stations worldwide, with an OpenAPI specification.

Currents API

Tidal current predictions for current stations: slack water, maximum flood and ebb, and signed speeds, with an OpenAPI specification.

Open Waters AIS API

Live vessel traffic streamed over WebSocket, with a GeoJSON snapshot of current positions, an aisstream.io-compatible endpoint, an MCP server for AI assistants, and an OpenAPI specification for its HTTP endpoints.

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