Corrected time = Elapsed time – (ToD * Distance)
With Time-on-Distance (ToD) scoring, the
coefficient of time allowance of one boat will not change with wind
velocity, but will change with the length of the course. One boat
will always give to another the same handicap in s/NM, and it is
easy to calculate the difference in elapsed time between two boats
needed to determine a winner in corrected time.
A special ToD coefficient calculated with an average crew weight of
170 kg is available for double handed racing as well as one
calculated for non-spinnaker racing.
Where is it shown on the certificate?
Time on Distance scoring
coefficients on simple scoring options on
ORC International and ORC Club certificates
|
TWS |
8 kn | 12 kn | 16 kn |
The resulting time allowances at wind of
8 knots will be accounted with 25 %, the one at 12 knots
with 50% and that at 16 knots with 25%. |
||
| Beat VMG | 40 % | 30 % | 20 % | |||
| 60 | 5 % | 15 % | 20 % | |||
| 90 | 5 % | 10 % | 15 % | |||
| 120 | 5 % | 15 % | 20 % | |||
| 150 | 5 % | 15 % | 15 % | |||
| Run VMG | 40 % | 15 % | 10 % |
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 and GPH calculations.
A custom-made ToD coefficient may be calculated using a different wind distribution matrix based on wind historical data or weather forecast for a particular race. Course model to be used shall be specified in the Notice of Race and Sailing Instructions.