[GPSNavX]

Version 2 of SailTimer will have the ability to create polars from the track log. That being said one could easily export the track log(s) to an MS Excel spread sheet, sort it by True Wind Angle and True Wind Speed then create linear averages for each wind range. If you have MacENC using Apparent Wind then you would first convert to True wind.

Formulas can be found here..

http://www.sailingusa.info/true_wind_calculator.htm