Question 1

What is a polar and why is it important?

Henri · Accepted Answer

Your boat’s polar determines all routing calculations. It represents your boat’s performance depending on wind speed and angle.
The application supports files in the .pol format (also used by Weather4D, SailGrib, Adrena, and others).

Question 2

What is a polar and why is it important?

Henri · Accepted Answer

Your boat’s polar determines all routing calculations. It represents your boat’s performance depending on wind speed and angle.
The application supports files in the .pol format (also used by Weather4D, SailGrib, Adrena, and others).

Question 3

How do I adjust the display of COG and heading vectors?

Francis · Accepted Answer

On the chart, the course vector on the ground COG is represented by a red arrow. The magnetic heading line is represented by a green line. Both are variable in length.

Open the app settings by tapping on the ⚙︎ icon, then select the My Boat section.

The length of the heading vector is defined in minutes of time, from 0 up to 300mn. In example, 30 minutes on course at a 6 knots speed displays a vector of 3 nautical miles. This vector varies depending on your speed. You can disable the arrowhead.
The heading line is set by distance on the chart, from 0 up to 300 NM. In example 20 nautical miles.

Question 4

How do you interpret a routing?

Henri · Accepted Answer

Once the routing is computed, the optimal route is shown on the chart together with the isochrone curves. These curves represent the positions that can be reached at successive time intervals from the start point.

You can move the boat along the route in two ways:

by dragging the timeline,
or by tapping directly on the routing at the desired location.

At each intersection between the optimal route and an isochrone, a wind barb is drawn. It shows the wind speed and direction at the time the boat reaches that position. If you route with current, a current arrow will also be drawn

Routing list

Open the lists panel (via the ☰ button at the top left of the screen) and select the Routing tab. This tab lists all computed routings.

For each routing you’ll see:

The routing name, shown in a specific color (matching the route color on the chart).
Departure and arrival times.
The total duration of the routing.
The route length and the increase vs. great-circle distance (i.e., the shortest path between start and finish).
The calculation timestamp.
A round button to open the routing table.
An eye icon to show/hide the routing on the map.

The routing table and its tabs

Click the orange button to open the routing table. It contains four tabs, each presenting a different facet of the computation.

Routing tab
- Shows, for each isochrone, the boat parameters at that time: speed, wind angle, position, etc.
Statistics tab
- Displays the distribution of speeds and wind angles encountered during the routing.
- Helps you see whether you’ll sail mostly upwind or downwind, and assess the average wind strength.
AI Briefing tab
- Automatically generates a weather briefing using our AI.
- When you click Generate AI Briefing, the routing data are sent to our AI server.
- The AI returns a complete briefing with four sections:
  - 1. General situation & evolution
  - 2. Forecast along the route
  - 3. Routing analysis
  - 4. Weather risks
  - It also includes links to synoptic charts and to the Météo-France bulletin.
- The AI Briefing is a Premium feature. Generation uses AI servers billed per use. Each Premium subscriber has a credit of 300 AI briefings per year, calculated on a rolling 365-day window.
- ⚠️ Warning: this briefing is generated automatically by artificial intelligence. It may contain inaccuracies or errors. Always consult official forecasts and exercise sound judgment and good seamanship in your decisions. The skipper remains solely responsible for the safety of the vessel and crew.
Input tab
- Summarizes all parameters used for the computation: weather models, coefficients, constraints, and departure settings.

What is a polar and why is it important?

What is a polar and why is it important?

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What is a polar and why is it important?

What is a polar and why is it important?

Related Posts

How do I adjust the display of COG and heading vectors?

How do you interpret a routing?

What is display scale setting?

How do I choose a polar file in the library?

Contact

Politique de confidentialité

Conditions Générales d’utilisation