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Side by side on their certificate data: measured dimensions for ORC and IRC boats, plus the ORC certificate's predicted speeds. Pick up to 2 boats.

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and 198 more - search to narrow

To add any boat, paste its public ORC certificate link on that boat's profile page. ORC certificates and IRC published boat data also link automatically overnight.

Select at least two boats to compare.

IRC vs ORCwhere the two rules disagree

Every boat holding both ratings, two independent measurement rules assessing the same hull. The line is this fleet's trend; boats off it are the ones the rules disagree about. Hover for the size of the disagreement; click a dot to add the boat.

Relative to this fleet, IRC rates Nizam about 90 s/hr slower than ORC does. A rating difference, not a speed difference - worth knowing when the same fleet scores under both rules.

whole fleet
0.981.131.291.441.59387436485534584633ORC GPH, s/mi (faster boats to the right)IRC TCCabove the line: rated quicker by IRCbelow: rated quicker by ORCNizam
48 boats holding both an IRC and an ORC rating · dashed outline = expired IRC cert · hover lights up sisterships

All figures come from each boat's public ORC certificate or IRC published boat data (IRC TCCs from club records); speeds are the ORC certificate VPP's predictions, not observed results. Measurements move together with boat size, so no single number explains a rating. The fairest comparisons are between boats of similar size or within one design classes.