Passage by DeepRegatta
Explainable weather planning for offshore sailing passages.
Passage audits the weather along your intended route before you commit to a departure. Instead of a single deterministic forecast, it shows you the conditions each leg is likely to meet, how much the forecast models disagree, and which assumptions the verdict depends on — so the go/no-go call stays yours, made with open eyes.
How a passage audit works
- Enter or select a departure point and destination to sketch your route.
- Choose a departure time, or scan a window of candidate departures to compare them.
- Inspect wind, tide, and current along each leg, the ensemble spread across forecast models, and alternative timings for the same route.
- Review the briefing's uncertainty and assumptions: active warnings, where models diverge, and how recent forecasts have shifted.
- Save the briefing as a snapshot to keep the decision context — the forecast evidence as it stood when you made the call.
Try it with an example route
A ready-made briefing for a Cherbourg to Plymouth crossing is built in. Open "See an example briefing" on the planner to explore the full audit — route timeline, tidal gates, warnings, and forecast evidence — without entering any personal data or creating an account.
What Passage is — and is not
Passage is a planning aid. It does not replace a current forecast, official marine warnings, or the skipper's judgment. Official marine forecasts remain the authority of record; always check them before departure, and treat every Passage verdict as evidence for your decision, not the decision itself.