Will rename but leave logic as is for now.  On a related point re. units:  How about changing the unit of wind speed to m/s?  I'm assuming that's what the raw forecast data is in, and having all internal in SI units would help with consistency.  At the moment I store boat speed in m/s because that works better with pyproj's SI units.  objects.wind could simply provide an additional method that gives kn for anything played back to a user.