ORCsy Certificate


ORCsy certificates comes in four A4 pages. The first page gives a general presentation of the boat with its rated boat speeds, in addition to the main hull and sail measurements.

The second page is presenting the scoring options.




   Page 1




   Page 2




   Page 3




   Page 4

The third page is showing a detailed list of measurements of the Hull and appendages, propeller, rig, flotation, stability, and the measurement inventory. The fourth page is reserved for measurements within the sails inventory. 

Place the cursor over different parts of the certificate page for a brief explanation. More details are given in the measurement and scoring sections, while complete definitions can be found in the appropriate rules documents.


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Boat description data includes Class, Designer and Builder as well as Age and Series Dates

Age Date is the month and year of the first launching, while Series Date is the Age Date of the earliest boat of an unmodified series built in production moulds or jigs.

Offset file describes the file used for the complete hull and appendages shape definition.

Hull data includes the boat's primary characteristics: Length overall, Maximum Beam, followed by Displacement, Draft Righting moment and Vertical Center of Gravity (VCG) given for light ship and sailing trims.


Measured and rated sail areas are shown for the largest sails of each type recorded: mainsail, headsail set on the forestay, headsail set flying, symmetric and asymmetric spinnakers, mizzen and mizzen staysail when they exists.

Total upwind and downwind sails areas are also shown.


The number of headsails set on the forestay, headsails set flying and spinnakers on board while racing is shown


Additional information about use of sail is give such as:

  • Number of furled headsails (not deployed) when sailing upwind
  • Mainsail Furler that may be in the mast or on boom
  • Use of multiple headsails
  • Unfurling staysail while tacking
Proportional scaled boat drawing with main rig and sail measurements which may include some items depending on the actual rig and sail configuration as follows:
  • The rig configuration details vary with the input. Thus, the spreaders diagrammed match the spreader count, the standing rigging matches adjustable stays recorded, an inner forestay is shown if recorded and split rigs are shown with a mizzen together with appropriate dimensions.
  • A bow sprit is shown if the headsail or asymmetric spinnaker can be tacked forward of the stem.
  • The transom geometry will represent the actual boat's transom in various types that vary from the default reverse transom to options that have an outboard rudder.
  • Asymmetrical spinnakers are shown according to the type declared for the yacht; i.e., the type which the rule requires to be tacked on the yacht’s centerline (with no pole aboard) or else an asymmetrical which may be tacked on a spinnaker pole.
  • Measured sail areas are printed for the largest of each sail type.
  • A cruising-type main with in-mast furler/reefer and/or a headsail furler/reefer is displayed if fitted.
As a result of VPP calculations predicted boat velocites for wind speeds in knots ar given for a complete set of polar plot for different wind conditions in the range of 6 – 20 knots of true wind speed from optimum beat, over 52, 60, 75, 90, 110, 120, 135, 150 degrees of true wind angle to the optimum run.
These predicted speeds can be easily used on boat for comparison with real performance and as it also shows Beat and Run VMGs with appropriate angles.

ORC Reference number is a unique number identifying that certificate and may be retrieved in the ORC database available at the ORC Sailor Services.

There is an issue date as well as a VPP version used together with the latest date for the validity of the certificate.  

A boat shall have only one valid certificate at any one time. The valid certificate is the last one issued.

ORC Certificates are valid for one year. This is because the VPP software calculations are updated yearly based on the ITC’s latest research of aero and hydrodynamics, as well as improvements made from analysis of race results and boat performance during the racing season, and submissions made from ORC Nominating Bodies.