ORC International Certificate


ORC International 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, propeller, rig and sail measurements.

It also contains information needed to enter the race like crew weight, limitations on use of sails, and stability index with the rated righting moment.




   Page 1




   Page 2




   Page 3




   Page 4

The second page is presenting scoring options in two sections: default scoring options that are present on each certificate and other scoring options that are selected for use by the relevant National Rating office. 

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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This is a space for the Rating Office logo. ORC Rating Offices are established worldwide in each country that has active offshore racing. Rating offices have several functions, including supervising the measurement and rating of yachts, supporting ORC racing by administering to their national fleets, and issuing ORC certificates.

For countries where a National Rating Office is not yet established, the central ORC Rating office can give support by issuing certificates.


There are three types of ORC International certificates that may be valid at the same time for any boat: general with full crew, Double Handed, and/or Non-Spinnaker, labeled clearly in this box. These will have their APH, CDL and ratings on Page 2 calculated specifically for that type.

Header on the ORC International Double Handed Certificate

Header on the ORC International Non-Spinnaker Certificate


All-Purpose Handicap (APH) is an average representation of all time allowances in all wind speeds and wind directions. It is also used as single number Time on Distance Rating. It may be used for simple comparisons between boats and possible class divisions.

General Purpose Handicap (GPH) is the number with similar intention as the APH used up to 01/01/2022 shown on the certificate as reference only.

Class Division Length (CDL) is the average of the effective sailing length (IMS L) and the rated length (RL) that is calculated from the upwind speed of the boat in a True Wind Speed of 12 knots. It is used for class divisions as a combination of the boat’s upwind speed and length.


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 while in measurement trim: Length overall, Maximum Beam, Draft and Displacement. as well as Displacement to Length Ratio (DLR).

IMS Division (Performance or Cruiser/Racer) is defined by IMS Appendix 1 where Cruiser/Racers are boats designed for cruising and are equipped with accommodation layouts at least comparable to the standards of series production boats. Boats not meeting these requirements are categorized in the Performance division. For boats complying with the ORC Sportboat Class Rules, IMS Dvision is defined here as Sportboat.

Dynamic Allowance is a rating credit representing the dynamic behavior of a boat taking into account performance in unsteady states (i.e., in heavy seas or while tacking). Age Allowance is a rating credit for age increasing each year up to a maximum of 15 years.

Propeller data includes propeller installation (in aperture, strut drive or shaft) and type of propeller (solid, folding or feathering) followed by propeller diameter.


CREW, an important factor affecting the boat's performance, is considered in the VPP rating calculations.

The weight of all crew members on board while racing may have a Declared value specified by the owner, but if not declared a Default figure is calculated and listed on the certificate.

The crew shall not be heavier than the Maximum value recorded on the certificate. And if the Notice of Race or Sailing Instructions specify, then the crew weight shall not be less than the Minimum shown on the certificate.

Non-manual power is rating assessment for the use of non-manual power with powered winches for halyards, sheets to trim clew of a sail or a boom, backstay, vang or outhaul.
Crew Arm Extension is a factor taking into account the possibility of extending the crew position beyond the sheerline, such as seen on Sportboats in accordance with Sportboat Class rules

Measured and rated sail areas are shown for the largest sails of each type recorded. Mainsail rated area will be increase from its measured value for the size of the roach and possible effect on the limit values of boom and mast diameters.

Headsails and spinnaker rated areas may be increased from the measured one when the measured area is smaller than respective minimum rated areas


The maximum number of sails allowed on board while racing according to the CDL. Headsails include those set on the forestay and headsails set flying. Spinnakers include: symmetric and asymmetric.

As only one mainsail is allowed regardless of a boat's rating, it is not listed here.

Additional information is also provided such as that all sails are made of woven polyester.

When there are both symmetric and asymmetric spinnaker in the sail configuration, use of asymmetric spinnaker on the bowsprit only may be declared and relavnt note is shown here specifing if asymmetric spinnaker may be tacked on pole or not. Furthermore, presence of spinnaker pole in non-spinnaker configuration is shown here.


The rated righting moment is shown here followed by Stability Index for boats with measured stability.


The owner and any other person in charge is responsible that boat is complying with her certificate in accordance with RRS 78.1 and ORC Rule 304.

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.


One of main advantages of the ORC Rating Systems is variety of scoring options which can be selected locally based on expected wind conditions, type of racing or fleet composition.

Simple scoring options includes: Time On Distance and Time on Time as well as Triple number, set of three different Time On Distance or Time On Time coefficients for different wind strengths.

All scoring coefficients are given for Windward / Leeward races (50% beat, 50% run) and Coastal / Long Distance races (Different percantages of beat, reach and run).

Scoring options are explained in more details in Scoring section.

An ORC International certificate provide a range of ratings, expressed as Time Allowances in s/NM for different wind conditions in the range of 6 – 20 knots of true wind speed for an optimum beat, and for 52, 60, 75, 90, 110, 120, 135, 150 degrees of true wind angle for an optimum run.
These time allowances are used in Performance Curve Scoring as a unique feature that is fundamentally different and much more precise than any other handicap system. It can rate different boats for different race conditions and course configurations by giving the boat’s theoretical predicted speeds for any wind condition and direction.

Scoring options are explained in more detail in the Scoring section.

Selected Courses
Four types of Pre-Selected courses are calculated from Time Allowances above:
Windward/Leeward (up and down) is a conventional course around windward and leeward marks where the race course consists of 50% upwind and 50% downwind legs.
Circular Random is a hypothetical course type in which the boat circumnavigates a circular island with the true wind direction held constant. 

Ocean for PCS is a composite course, the content of which varies from 45% Beat VMG and 55% Run VMG at the 6 knots with decrease of Beat and Run parts and increase of reaching parts with increase of the wind speeds;

Non Spinnaker is a circular random course type (see above) but calculated without the use of a spinnaker or any headsail set flying. 

Special Scoring

Special scoring options are available in Time on Distance and Time on Time coefficients for Double Handed and Non-Spinnaker configurations.

Double handed ratings are calculated for a crew weight of 170 kg, and Non-Spinnaker ratings are shown for offshore races for which Performance Line coefficients are also given.

Double handed ratings are shown on the certificate when this option is selected by the Rating Office. The Rating Office may also produce a separate Double handed certificate where differences can be found in rig and sail measurements, not just crew weight, for the same boat.

Scoring options are explained in more detail in the Scoring section.

Class Division Length

Class Division Length (CDL) is the average of the effective sailing length (IMS L) and the rated length (RL) that is calculated from the upwind speed of the boat in a True Wind Speed of 12 knots. It is used for class divisions as a combination of the boat’s upwind speed and length.

Storm Sails Area

Maximum area for storm sails as required by the WS Offshore Special Regulations: Heavy Weather Jib, Storm Jib and Storm Trysail.