About OpenSail
Institutional-grade routing.
Built for real passages.
OpenSail was born from a simple frustration: existing routing tools treat comfort as an afterthought and lock critical data behind proprietary walls. We built the platform we wished we had — one that treats a family passage with the same rigor as a commercial delivery, with full transparency into the data and models driving every recommendation.
Core Capabilities
Multi-Model Forecasting
GFS, ECMWF, AIFS, CMEMS — cross-referenced and bias-corrected. See where models agree and where they diverge before committing to a passage.
Comfort-Aware Routing
Four routing modes (Fastest, Balanced, Family, Comfort+) with heel angle, beam-sea discomfort, and slamming risk scoring. Every segment rated 0–10.
API-First Architecture
Full REST + WebSocket API with developer keys. Integrate OpenSail into your nav stack, B&G MFD, SignalK server, or custom applications.
Safety Engine
Land avoidance from ETOPO bathymetry, coastline buffering, ice cover detection, depth validation, and configurable wind/wave safety limits per routing mode.
Real-Time Data Pipeline
Automated ingest from NOAA NOMADS and Copernicus Marine. New model runs are processed within minutes of availability — no stale forecasts.
Vessel Intelligence
Polar diagram management, hull-speed estimation from vessel parameters, and per-vessel routing that accounts for your boat's actual performance envelope.
Technical Specifications
The Future: Crowdsourced Marine Intelligence
Charts miss things. Shoals shift, debris drifts, hazards appear and disappear faster than any hydrographic office can survey. OpenSail is building a crowdsourced hazard layer — sailor-reported data that makes every passage safer for the next crew.
Uncharted shallow water at exact coordinates, verified by multiple reports
Containers, deadheads, whale carcasses, fish traps — time-decaying markers
Real holding quality, swell exposure, and protection ratings from crews who've been there
GPS-derived current vectors from active voyages improve model accuracy over time
Product Roadmap
Phase 1 — Live
- GFS + CMEMS real-time ingestion
- Isochrone routing with comfort scoring
- Departure window optimizer
- Live voyage tracking (public + private)
- Subscription pause/resume for off-season
Phase 2 — Depth
- Offline GRIB packs for bluewater passages
- ECMWF AIFS + ICON-EU regional models
- Ensemble uncertainty visualization
- Native iOS + Android apps (Capacitor)
- SignalK instrument integration
Phase 3 — Intelligence
- AI regional downscaling (CorrDiff)
- Crowdsourced hazard reporting
- B&G / Raymarine / Garmin MFD integration
- AIS ship position overlay
- Fleet routing for commercial maritime
Ready to plan your next passage?
Free tier includes full forecast visualization and basic routing. No credit card required.