. Also note the tool has no way of knowing the true wind at any given moment, so I basically just estimated it at 270 deg.
Mike.
That software estimates wind direction by finding a symmetrical polar diagram, assuming you get the same course to windward/downwind on starboard or port tack. it's quite nice but a change in wind direction during your trip will mess up your polar. see the attached polar, it appears as 35 degrees would be fastest upwind, but this was probably caused by a 10 degrees windshift...
