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reverse isochrone Isochrones mark the locations of equal times traveled from the start of a route. See isochrone. Reverse isochrones are the same thing measured as equal time to go to the destination. They are computed as if start and finish were reversed. They show where you want to be as you get closer to the finish and have to make diversions from the forecasted route. In a race they also show which boats equivalent to your own are ahead or behind at the moment. When isochrones and reverse isochrones are parallel for a notable distance it is assurance that the route is fairly stable at the location, meaning off to one side or the other does not have much affect on the finish time. When the two just touch like an hour glass, the route is very sensitive at that location and we need to look into what is causing that.

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