Eleven models, one answer you can act on

Three products, one loop

Every race that is judged teaches the lake's wind.

This is Navigatek's newest idea, and it only exists because the three products talk to each other. Navigatek Juge tracks the whole fleet by GPS, one phone per boat, for the start and the results. But those tracks say something else too: where each boat tacked, what heading it held, where it was headed. In other words, the wind — measured wherever the fleet has sailed, not only where one instrumented boat happened to pass.

It is 6Ai's wind AI that knows how to read that wind in a track with no wind vane. Every night it learns from the day's races, and Navigatek Meteo receives the map. The club races on Wednesday evening; by Thursday morning, the map of the lake knows more — for everyone.

1. Juge: the fleet races

   Each crew sends its position from its own phone. The tracks serve first for the start and the results; they also serve, aggregated and anonymous, to learn the wind. It says so on the start screen, and no boat name leaves it.

2. 6Ai: reading the wind without a vane

   The wind AI rebuilds the wind direction from the track alone: course over ground, the tacking angle measured in the track, and Meteo's consensus to tell upwind from downwind. Each boat is compared with the others at the same minute.

3. At night: everything is relearned

   A finished race or a new outing triggers, the following night, a relearning of the map and then its delivery to Meteo. A failed step is retried the next night; nothing is sent until the map has been rebuilt successfully.

4. Meteo: the forecast on the lake

   The map covers more water, and the forecast gets translated: the diagram shows side by side the direction the models announce and the one the lake will make of it. With a south-westerly regional wind, for instance, the lake blows 48° further south.

• Without

  A wind map simulated from the terrain, the same whatever sailors have actually seen on the water.

• With Navigatek

  A measured map that grows richer with every club race: the more the fleet races, the more water it covers, for everyone.

• 99.6 %correct tack read from a track with no vane, checked against an instrumented boat's vane
• 92 → 133hundred-metre squares covered in the north of the lake, at 8 knots, once the fleet is added
• 19.2° → 14.6°between forecast wind and lake wind, judged out of sample over 24 h of real forecasts

What the fleet does not bring yet is written down too. Where the instrumented boat can check, the map's accuracy goes from 83.8 to 84.8 %: the fleet widens the map, it does not yet make it more accurate. Each new race is added to the history, and the measurement is redone.

The forecast, turned into a route

Draw the course on the map; Meteo finds the fastest way round it.

A forecast tells you the wind. The map of the water tells you what that wind becomes, square by square, from thousands of measurements taken while sailing. Put the two together and a question becomes answerable that no weather app asks: given this course and this hour, which way round is fastest? You drop the marks on the map — start, marks, finish — pick the race hour, and Meteo routes a J/70 through the flows, square by square.

The answer is a line on the map and a number: here 41:08 for 5.74 km and 5 manoeuvres, with each leg detailed — downwind to the mark in 18:47 with one gybe, upwind back in 22:21 with four tacks. It is computed from the J/70's ORC polar, 8 seconds per tack or gybe, and the wind of the chosen hour as the lake will make it, frozen for the race, without other boats. A decision aid, not a promise — and it says so under every result.

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1. The wind of the hour, on the lake

   The eleven models give one direction for the region. The map of the water, built from measurements and from the fleet's races, says what the lake makes of it in each hundred-metre square — the flows you see drawn.

2. The course, as you will sail it

   You trace it on the map in order: start, marks, finish. The same marks the race committee drops, the same the boat's coaching knows.

3. The fastest route, square by square

   Meteo moves a J/70 through the flows with its polar, counts each tack and gybe, and keeps the fastest way round. The line on the map is the recommendation; the numbers are its proof.

• Without

  One wind for the whole lake, and the route is worked out in your head on the dock.

• With Navigatek

  The wind as the lake will make it, and a route through it, timed leg by leg — before leaving the dock.

• 41:08estimated for 5.74 km and 5 manoeuvres on the course of 1 October 2026 at 16:00
• 210° → 168°the south-westerly the models announce, and the south-south-easterly the lake makes of it
• 49,288wind observations on the water behind the map that the route is computed on

What it does not do is written down too: the wind is frozen at the chosen hour, the other boats are not there, and where the lake was never sailed the flow is only deduced from the relief — the map says so, and the route inherits that uncertainty.

What's new

What Meteo does that no weather app does.

Five positions taken, all checkable against the data.

• Disagreement as information

  Others show a value; Meteo shows the spread too. When eleven models agree, you build a race plan on it. When they diverge, you know before leaving the dock — often the most useful fact of the day.

  ±1.4 kn and ±9° between models → HIGH confidence

• A map measured, not simulated

  The map of the water comes from thousands of wind measurements taken while sailing, not from a terrain model. And it says what it does not know: the share of the lake never sailed is displayed in plain words.

  16.8 % measured · 76.7 % never sailed — and it says so

• Pockets, not halves

  “The left side pays”: measured over eight wind directions, the difference between the two halves of the lake is only 0 to 2.5°, and it changes sign. There is nothing to bet on. Pockets, though, are real — so the advice names pockets: “in the centre, +20° over twelve neighbouring zones”.

  2,353 observations behind that one piece of advice

• An answer that cites its sources

  No language model on the forecast path: the same question gives the same answer. Each piece of advice says whether it comes from the MODELS or from the WATER, and when nothing separates two options, it says so instead of inventing a bet.

  Same question, same answer

• A route on the forecast

  Weather apps stop at the wind. Meteo takes the course you draw and the wind as the lake will make it, and recommends the fastest way round — timed leg by leg, tacks and gybes counted, from the J/70's polar.

  41:08 · 5.74 km · 5 manoeuvres, before leaving the dock