Unfortunately, the IMHRR will no longer be available due to lack of demand.  It does not make any sense to offer ratings if no current regattas will be using the rule.  If circumstances change and there is increased demand for the rule, the site will be re-activated.  In the meantime, please visit www.caribbean-sailing.com for competitive multihull ratings for regattas in the Caribbean.  Existing ratings for teh 2020 season are shown but no new measurements will be taken until further notice.

Our main task of adapting the well established Texel Rating system to the local requirements of multihull racing in the Caribbean and other diverse areas of the globe has remained unchanged.  The formulas and calculations used in our rating system are based on those used successfully for the Texel Rating and its derivatives such as Multihull Dynamics, Multi 2000, Swedish Rating System and OMR among others.  We have not attempted to reinvent anything but have merely adjusted the rule to:

  • Bring measurements and certain calculations in line with the International Measuring system (IMS)
  • Accommodate yachts with different sizes and types of daggerboards
  • Accommodate yachts that use foils to reduce their wetted surface area
  • Accommodate yachts with canting rigs
  • Make use of dual wind band ratings to fairly rate yachts in different conditions
  • Simplify the process of obtaining a rating for production multihulls that are less race oriented
  • Simplify the formula to directly produce Time Correction Factors that will assist regatta organisers to process results

The base concept rule has been used successfully since 2014 and has been constantly refined and improved as requirements of the racing fleet have evolved.  It has been found to return tighter corrected times that reflect yacht potential better than comparable systems.  Development of the rule will continue over time to address new innovations in yacht design.