Input your boat's measurements to come up with a MASF Rating .
	For the mast factor use .8 for fixed masts and .9 for rotating  masts and 1.0 for rotating wing masts.
	Catamarans enter 0 for the AMA Length.

After listing your measurements and clicking the calculate button two numbers will be calculated.  The rating and the corrected time (in seconds) for a 1 hour race.   Compare this corrected one hour time to other boats or your previous rating to get how much time you owe or are due for each hour of racing. To calculate Corrected time, just multiply the rating by the elapsed time.