ORR-Ez is the ORA handicapping rule that has been created for regional or less intense racers. The initial expense and annual certificate fee to the boat owner are significantly lower than for a full measurement rule like ORR. It is also less accurate. Primary speed factors are determined from existing measurement databases of production boats and ORR certificates and simple sail measurements.
The limited data is run through the ORR Velocity Prediction Program (VPP) to produce certificates. In some case where the boat design is not-competitive subjective corrections can be made by the National Rating Review Committee. Like ORR, race organizers may select from customizable wind mixes to match the range of boats in the fleet to the expected wind speed and degrees of upwind, downwind and reaching on the race course.