Open Source Marine Software and Data

Understand and navigate the sea with tools built through open source collaboration.

A nautical-themed map with depths, seamarks, and hazards.

A map of the seafloor with contours, depth shading, and soundings.

Tide predictions powered by the Neaps engine, with data from thousands of stations worldwide.

aiscast streams live vessel traffic from open government feeds and volunteer receivers, by bounding box.

Sunrise, moon phase, stars and lunar eclipses for any position, computed offline by the Almanac engine.

Collect and share depth data from your vessel to contribute to crowd-sourced bathymetry programs.

Get Involved

Join our community of mariners, developers, and ocean enthusiasts building better tools for the sea.