ORC Club Scoring Options


ORC Club is offering three different methods of calculating corrected times. Each method is suitable for different wind conditions, but the choice of selected scoring method may also depend on the type and size of local fleet and type of race. Scoring method should be defined in the Sailing Instructions and list of all ratings shall be available to all competitors before the start.

Scoring options are presented on the ORC Club certificates in the same form just as on the ORC International certificate. ORC Club Scoring options may be customized by the national rating office to have preffered scoring options printed in black and all other in grey, but all the scoring options are always available for use internationally.

Time on Distance


Corrected time is calculated by the distance coefficient as follows:

Corrected time = Elapsed time - (ToD * Distance)

This is the most popular method of calculating corrected time. With Time on distance (ToD), the coefficient of time allowance of one boat will not change with wind velocity, but will change with length of the course. One boat will be always be giving to another the same handicap in s/NM, and it is easy to calculate the difference in elapsed time between two boats needed for a win in corrected time. The ToD method is best used in constant wind conditions.

Time on Time


Corrected time is calculated by the time coefficient as follows:

Corrected time = ToT * Elapsed time

With Time-on-time (ToT) scoring, the time allowance will increase progressively as the wind velocity increases. Course distance has no effect on the results and does not need to be measured. Corrected time will depend only on the elapsed time and the difference between two boats may be seen in seconds, depending on the duration of the races. The longer the race, the larger the handicap. The ToT method is used where tidal current is strong and when wind conditions are highly variable on the race course.

Performance Line


Corrected time is calculated by two coefficients as follows:

Corrected time = (PLT * Elapsed time) - (PLD * Distance)

With the time coefficient PLT and distance coefficient PLD, two boats may be rated differently in light or heavy wind conditions. While the length of the course is a fixed value, it is possible that one boat is giving a handicap to another in light wind conditions, while the opposite may be true in heavy wind conditions.

Triple Number


Corrected time is calculated by the time coefficient as follows:

Corrected time = TMF (Low, Medium or High) * Elapsed time

The Triple Number system provides a set of three time multiplying factors TMF’s (as described above for Time-on-Time) given for three wind ranges:

  • Low Range (less or equal 9 knots)

  • Medium Range (between 9 & 14 knots)

  • High Range (greater or equal 14 knots)

The Race Committee shall signal before the start the wind range to be used for scoring, but it may change this in case of significant change in the weather conditions.

Course types


Each of time or distance coefficients in above mentioned formulas are given for different course types:

  • Inshore - as windward/leeward course around the buoys with 50% upwind and 50% downwind angles.

  • Offshore - used on coastal/long distance races where different wind directions may be expected.


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