Make your best routing decision.

Each result shows the change in predicted finish time. When a route differs from the baseline, the panel gives the place where the tracks first separate and overlays the alternative on the chart.

Use the results to see which conditions and places make routes diverge. It runs in your browser against the forecast already downloaded, with no further network request.

Open the route, take a fix, and name the mark you still have to round. Race mode solves the rest of the course from the boat's current position and returns a heading, upcoming tacks and gybes with their times, and a predicted finish.

Race mode solves ashore and sends a small readout to the boat. Re-route from a fresh fix when conditions change, or set it to re-route on a timer.

A wave ceiling excludes water above the limit from the route. A calmer-water preference lets the search favor lower sea state when comparing routes.

Every route reports the sea state it meets along the way, including how long it spends in rough water. Set your draft and a depth margin to exclude water that does not meet them.

Import a polar in matrix CSV, TSV, .pol, or Expedition or PredictWind angle-speed format. The format is detected automatically.

A pasted polar is temporary unless you explicitly save it to your private account. Shared shared routes carry the track, never the speed table that produced them.

Routes are worked out in your browser from your boat's performance: an ORC certificate, a polar table you provide, or one saved to your account. See the reference docs for setup and data details.

Leebow also publishes Saildex results and hosts regattas. For Graham's sailing projects, visit Leebow.