HalSail implements time-on-time handicapping according to the Offshore Racing Congress (ORC) methodology. If you choose ORC as the type of handicap for a racing class, all series for that class will use ORC style handicaps, although you do not have to stick to the official ORC handicap numbers.

ORC handicaps in HalSail use the triple-number system for low, medium and high wind speeds. The race officer is asked to stipulate the min and max wind speeds and the average is used to determine which of the triple numbers to use in that race - low, medium or high. In accordance with ORC guidance, low wind speed handicaps are used up to 9 knots, medium wind speed handicaps from 10 to 13 knots and high wind speed handicaps at or above 14 knots.

If you wish to use single-number ORC handicaps you have two options:

• either make the low, medium and high values in the triple-number system the same;
• or use generic TCF handicaps, which are mathematically identical to the ORC time-on-time system, and give the handicap system the local name of ORC.

For more information, you might like to see the video on this subject