Club2Class Knowledge Base

Edit a Boat Class Rating

Club Administrators can use this tool to edit the rating information for a particular boat class within a rating system.

To access the editor navigate to your Club Administrator Tools and choose Manage Boat Classes from the Rating Systems Management section. This will show a list of Boat Classes. Click on for any Boat Class to edit and view a list of all ratings for that boat class. Click on for any particular rating to edit the rating infomation.

When editing a rating for a boat class in a rating system you can specify the Time Correction Factor and the Display Rating.

The Time Correction Factor is a number which is used to multiply the time taken by a boat to complete a race (the elapsed time). The result of this multiplication is the corrected time. The corrected time of competitors is used to determine their finishing order.

The Display Rating is related to the Time Correction Factor via a ratings formula. For example formulas used by the RYA Portsmouth's Yardstick system or US Sailing's Performance Handicap Racing Fleet system. At Club2Class we don't explicity enforce any particular formulaic relationship. Instead we allow you to specify both the Time Correcttion Factor and the Display Rating. The elapsed times are multiplied by the Time Correction Factor to produce corrected times for scoring. The Display Rating should be the rating that is most commonly understood by competitors and is displayed in race results.

For example, the RYA's Portsmouth Yardstick system uses a rating known as a Portsmouth Number (PN). For a class such as the RS 800 in 2018 the PN is 799. To calculate the Time Correction Factor we follow the rules of the Portsmouth Yardstick system as specified by the UK's Royal Yachting Association. These state that corrected elapsed times are calculated by multiplying the elapsed time by 1,000 divided by the PN. In this case then the Time Correction Factor to enter into Club2Class would be 1,000 / 799 = 1.25156. We would enter the PN of 799 into the Display Rating field though as this is widely recognised by competitors. Then all race results will use the Display Rating as the rating applied. This is beneficial as the PN is more easily reconciled by competitors familiar with the Portsmouth Yardstick system than the Time Correction Factor.

Using this approach allows the specification of a broad range of rating system methodologies and separates the calculation inputs and display outputs.