Selected by default, this option allows a tack or a jibe within each isochrone. The boat can sail into the wind and downwind with 2 legs per isochrone.
Few routing software offer this option which is very effective.
It has a drawback while cruising as it often offer to sail very short legs and tack or jibe frequently.
If you uncheck, routing will be a bit slower but with fewer tacks or jibes.
Here is an illustration for a route off the islands of Oléron and Ré:
- in green, a routing where tacks are allowed during an isochronous for a total of 28 tacks;
- in blue, without tacks within an isochrone in, for a total of 8 tacks.
The difference in time is only 4 minutes for an 8 hour sailing trip…
