Features

Every claim on this site is a page you can interrogate

These are the six capabilities that make OpenSail different from the apps it replaces. Each deep dive shows the real interface, explains how the feature works under the hood, and lists its honest limitations, because a tool you trust at sea is a tool that admits what it cannot do.

Anchor Check →

Know your night before you sleep on it. Hour-by-hour anchorage verdicts for the next 48 hours.

Model Agreement →

GFS and ECMWF re-sampled along your actual route, with an honest verdict on where they diverge.

The Routing Engine →

Rust isochrone solver, real bathymetry against your draft, land-proof segments, structured refusals.

Departure Planner →

Compare departure windows side by side — with a briefing that explains the recommended one.

Compare All Modes →

Four routes solved against the same forecast, one recommended by the Intelligence Layer — reasons attached.

Offshore & Satellite →

Corridor GRIBs sized for Iridium, route requests by email, and an offline map that never fakes freshness.

Or skip the reading and open the product

The live map is free, no account needed. Real forecasts, real routing, right now.

Open the live map