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Old 10-16-2008
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These acronyms are abreviations for various rating rules. Rating Rules are different than Handicapped rules in that the boat is measured to obtain its rating and so designers can try to beat the rule to gain an advantage, but in doing so they are typically distorting a design in a manner inconsistent with the best design practices which would be followed if there wasn't a rule they were trying to beat. The most common are:
CCA- Cruising Club of America
RORC- Royal Ocean Racing Club
MORC- Midget Ocean Racing Conference
IOR- International Offshore Rule (or Rating)
MHS- Measurement Handicap System (I've seen other names that I can't recall at the moment)
IMS- International Measurement System
IRC- International Racing (I'm not sure what the 'C' means)

Jeff
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