When good ratings meet real scoring

The PHRF rating system may not be the best, but it is the simplest for handicapping dissimilar boats. It gets people on the water, but to get a better sense of a boat’s overall performance, the ORC system has gained traction in North America. In a series of reports, Thomas Nilsson seeks to explain why ORC’s complexity is necessary:

In the first article, When Averages Stop Being Fair, I explored why a single rating number can never fully describe how a boat behaves across all conditions. Boats are not constant machines; they respond differently to wind strength, wind angle, and course geometry.

That naturally leads to the next question: Once we have a rating that represents the reality of the racing conditions, how do we actually use it to score a race?

This is where theory finally meets practice.

One of the most common misunderstandings around ORC is what we mean by “the rating.”

The rating is often reduced in everyday conversation to a single number — APH (All-Purpose Handicap), CDL (Class Division Length), or similar. But in reality, the ORC rating is a matrix of time allowances, covering different wind strengths and wind angles. That full matrix is what the VPP produces.

The winner of a race is therefore not decided by “the rating alone,” but by how the rating is applied through a chosen scoring method. Most sailors, however, first encounter ORC through Single Number scoring, and that is where we begin. – Full report