Time On Time

  Corrected time is calculated as follows:

Corrected time = ToT * Elapsed time

With Time-On-Time (ToT) scoring, the time allowance will increase progressively through the duration of the race. Course distance has no effect on the results and need not be measured. Corrected time will depend only on the elapsed time, and the difference between boats may be seen in seconds depending of the duration of the races. The longer the race in time, the larger the handicap.

Special ToT coefficients are calculated with an average crew weight of 170 kg for double handed racing, as well as one calculated for non-spinnaker racing.


Where is it shown on the certificate?



Time on Time scoring coefficients on simple scoring options on
ORC International and ORC Club certificates


How is it calculated?

  Coastal/Long Distance Time on Time scoring coefficient is calculated as:
          600 / Coastal/Long Distance ToD
  Windward/Leeward Time on Time scoring coefficient is calculated as:
          675 / Windward/Leeward ToD

A custom made ToT coefficient may be calculated using conversion factor to the custom made ToD coefficient  A conversion factor may be set as ToD representing the middle of the fleet. Use of different correction factor will not change the place in corrected times, it will only affect the differences in corrected time.


Double handed coefficient is calculated with crew weight of 170 kg, while non-spinnaker rating is calculated for boat's performance without spinnaker. Double handed and Non-spinnaker ratings are given for both OSN (Offshore Time on Distance) and GPH calculations.


Handicap calculator

    Boat A     Boat B
ToT Coefficient    

ToT Coefficient

Elapsed Time    







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