DeepRegatta/Guides
Guides · answered from evidence
Questions sailors ask, answered from race evidence.
Each guide starts from a specific question, answers it in the first paragraph, and shows the evidence — a real chart, map or replay from the DeepRegatta archive — with the methodology and its limits stated plainly.
- OSCAR · race replay
How do you replay an offshore race after the finish?
Replay an offshore race from public tracker data: rebuild the fleet, compare boats against polars, current and routing — shown on Rolex Fastnet 2025.
- Retrace · IRC
What makes a boat beat its IRC rating?
What makes a boat beat its IRC rating? Evidence from 597 modeled races and 14,842 boat entries: relative boatspeed carries most of the signal, not routing.
- Retrace · ORC
What decides races sailed under ORC?
What decides races sailed under ORC? In 72 modeled races boatspeed leads, but routing — including distance lost to missed shifts — counts far more than under IRC.
- Retrace · Class40
What separates the leaders in a Class40 fleet?
What separates Class40 leaders? In 14 modeled offshore races boatspeed leads, but wind strength and weather luck weigh more than in any other fleet studied.
- Retrace · Mini 6.50
What wins Mini 6.50 races — in Série and in Proto?
What wins Mini 6.50 races? In identical Série boats results are nearly pure boatspeed; in Protos, bold routing enters the mix. Evidence from 85 modeled races.
- Passage · planning
How should you plan the weather for a passage?
Plan passage weather leg by leg: evaluate forecast conditions across each leg's ETA window against your own declared limits — a Cherbourg–Plymouth example.
- Passage · risk
How do you measure the forecast risk along a route?
Measuring forecast risk along a route: check every ensemble scenario against your declared limits per leg, and treat model disagreement as a signal to wait.