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The document provides information about the International Measurement System (IMS), which is a handicapping system for cruising and racing yachts managed by the Offshore Racing Congress. The IMS uses computer models based on hydrodynamics and aerodynamics to predict boat speed and provide elapsed time corrections. The ORC will update the system as improvements are made to speed predictions. The full details of the IMS speed prediction and time allowance formulae are in the Velocity Prediction Program (VPP) available from the ORC.


























































































