IRC is a self-measurement system.  There is no requirement either to have your boat officially measured or weighed unless you want to, your IRC Rule Authority requires it, or you need an Endorsed certificate.
 
Generally, acceptable sources of data are as follows.
E* denotes acceptable for Endorsed certificate
 
Linear measurements (hull, rig) :
E* Measurement by an official measurer
E* One-design data for approved IRC one-design classes
Owner or representative measurement
Data from other rating or handicap certificate for this boat, not officially measured
Designer or builder data *
Class standard hull data
 
Linear measurements (sails) :
E* Official measurement by an authorised sail measurer
E* Measurements supplied by an ISAF IHC sail loft unles prescribed otherwise by the IRC Rule Authority in a country
Data from other rating or handicap certificate for this boat, not officially measured
Owner or representative measurement
 
Weight:
E* Weighing on an approved single point loadcell, verified by an official measurer
E* Weight derived from other, officially measured rating certificate for this boat
E* Weighing on approved compression load cells, verified by an official measurer
E* One-design data for approved IRC one-design classes
E* Light class standard weight for established production designs
Class standard weight or sistership weighed data where appropriate
Weight derived from other rating certificate. (E* at the discretion of the Rule Authority)
Weighing on weighbridge is usually accepted unless we believe it to be in error
Designed weight, or derived from designed sailing displacement *
 
The following are NOT acceptable :
Registered Tonnage
Weighing on built-in loadcell of crane
Weighing on loadcells on travel hoist
 
* Some basic data from a sales brochure is usually acceptable (eg. LH, Beam, Draft), but we reserve the right to use different data where we believe it to be more accurate.
 
Please contact your Rule Authority if you wish to arrange measurement or weighing by an approved measurer.    
 
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Header images by:

John Crawley (CAN IRC)  
Jinno (c/o JPN IRC)
 
 
 
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