Time-on-Time: Each boat had a Time Correction Factor (or coefficient) that is multiplied by the boat's elapsed time to compute its corrected time; the boat with the lowest corrected time wins. This system works particularly well in regions where tide can speed up or slow down races. Time-on-Distance: This is a scoring system in which each boat's elapsed time has added to it the product of the distance of the race and the boat's rating. Performance Line: This system has both elapsed time "A" factors and race distance "B" factors. It is believed to work well in various wind conditions, but works poorly in areas with tidal flow or in races in which the wind conditions change during the race. It is more complicated to use than either time-on-time or time-on-distance, but is simpler than IMS Performance Curve Scoring.