Polar Editor

The Njord Polar Editor lets you view and edit polars and targets for your boat.

Open at: app.sailnjord.com/polars/

The editor is free to use and does not require a license or account. When logged in, you can additionally load polars and targets from a boat in your Njord account and save changes back to it.

Polars vs. targets

Polar — describes expected boatspeed as a function of TWS and TWA across the full wind range. Useful for general navigation, passage planning, and performance prediction. Boat designers sometimes provide polar data, but the most accurate polars come from analysing real on-the-water performance — which Njord Analytics helps build over time.

Targets — define the optimal boatspeed, TWA, and heel for upwind and downwind VMG at each wind speed. Targets are the primary reference in windward-leeward racing: they tell helmsman and trimmer what numbers to aim for on each tack and gybe.

Some file formats support both polars and targets; others support only one. The editor shows which data is present in the loaded file.

Using polars and targets in Njord Analytics

When you save a polar or targets file to a boat in your Njord account, it is applied to all subsequent data uploads: polar and target values are inserted into each log file based on the TWS and TWA recorded. This makes target numbers available as channels in all visualizations.

You can manage multiple versions of a polar or targets file in the boat's settings and select which one is active.

Building polars from your own data

The Targets and Polar Diagram views in Njord Analytics each have a button to open the current analysis directly in the Polar Editor — useful for smoothing, adjusting, or merging before saving back to the boat. Treat the output from these views as a starting point rather than a finished polar; some manual editing is usually needed before the data is suitable to use as targets.