The International One Metre Class

USA88 Bill Langjahr and USA42 Jerry Brower from Pacific Northwest
Fleet rounding an off set mark at 2011 Mid Winters Regatta

Class Secretary
Bob Wells
2021 81st Ave SE
Mercer Island, WA 98040
206 915-2442
Class Administrator
Ted Flack
2713 Mandale Lane
West Bloomfield, MI 48324
248 804-5468


Download Class Rules History of Class Rules Class Site
Contact Your Class Secretary to Register Your Boat


The International One Metre class is the fastest-growing class in the world. This class is distinct and different in purpose from the US One Meter class, and complements the International Marblehead Class as a simpler, less expensive boat. The International class has a one-design rig, and has minimum weights on the keel and overall, and restricts the hull material. The net effect of these differences is that the typical cost spiral of lighter weight, and more expensive materials and manufacturing processes, is arrested. This allows amateur designers and builders a chance to design and build with little concern that they are building in a disadvantage due to weight. This is a feature not found in any existing AMYA class, and is one of the reasons that the class is so popular around the world.


The International One Metre class is "recognized" by the AMYA. In order to register boats in the United States, use the standard AMYA procedure and fee of $7, and send to the Class Secretary. In return for your application, he will issue you a unique registration number. According to the ( International Class Administrative Rules, the last 2 digits of your registration number are your sail number.

Official Class Measurers are available throughout the country. For more information contact the Class Secretary.

AMYA Class Rules

The AMYA Class rule is simple:

1.0 The AMYA International One Metre Class adopts the current International One Metre class rules, together with all applicable rules referenced by it, with the following exceptions:

1.1 There are currently no exceptions.



1. Introduction

  1. This Ranking System ("System") has been developed to allow the USA NCA to select eligible, class participating members for Restricted Events, which are events that have limited allocations of participants by country. Due consideration was given to class growth, participation and traveling restrictions.
  2. The IOM Class is considered a Development Class by the AMYA. However, the USA IOM Class shall rank Skippers, not boats, in determining ranking, superseding AMYA By-Law 8.5.
  3. This System shall be effective as of January 1, 2012.
  4. The System shall run continuously, so it can be applied at any time.
  5. The ranking of Skippers as of six (6) months prior to the Restricted Event shall be used to determine the allocation of places for each Restricted Event.
  6. Skippers wishing to participate in a Restricted Event must complete an expression of interest form as explained in Section 9 below.

2. Skipper Eligibility

  1. Ranked Skippers must be AMYA members in good standing at the time of any Ranking Regatta to qualify.
  2. Nationality requirements will be in accordance with the relevant ISAF regulations, (presently Section 19.2- 2007 ISAF Regulations-3693).

3. Event Eligibility

  1. An IOM Ranking Regatta shall be pre-approved by the USA EVENT COMMITTEE and approved by the NCA Secretary.
  2. A Ranking Regatta shall be posted on the USA NCA site sixty (60) days prior to the first day of the event, except under unusual circumstances when an event may be posted to the USA NCA website thirty (30) days prior to the first day of the event as determined by the NCA secretary at his/her discretion.
  3. A Ranking Regatta shall be scheduled to include a minimum of two (2) racing days.
  4. A Ranking Regatta shall utilize the current USA IOM Notice of Race and SIs. Any deviation from either form must be pre-approved by the NCA Secretary and posted at the time of the initial NOR posting.
  5. Minimum Ranking Regatta measurement shall consist of: certificate check, keel weight check, all up weight check with each rig, and a legibility check of sail identification. A float tank is strongly recommended; however, the class is aware of the logistics issues. A float tank is mandatory for National Championship Regatta Measurement.

4. Ranking Events

  1. The first qualifying Ranking Regatta shall be the first Ranking Regatta immediately following the last Ranking Regatta counting toward the prior Restricted Event. The last qualifying Ranking Regatta shall start no later than 6 months prior to the date of the Restricted Event. This period is the "Event Cycle".
  2. Ranking for allocation of places for a Restricted Event is effective six (6) months prior to the first day of racing of the Restricted Event.
  3. Any Ranking Regatta in progress on the day of the cutoff will have its results counted in the current Event Cycle.
  4. Every Regional Ranking Regatta and USA National Championship Regatta shall be a ranked event unless the organizer specifically requests that the regatta not be included in that Event Cycle. This request is subject to approval by the NCA Secretary.
  5. Regattas within Canada may be designated a Ranking Regatta and utilized within this Ranking system.
  6. Events held in British Columbia area, Toronto and Kingston (CANADA) shall be part of Regions 6, 2 and 1 respectively.
  7. There shall be no restriction on the number of Ranking Regattas during a year.

5. Rank Scoring

  1. The top five (5) scores of Ranking Regattas in an Event Cycle shall be utilized in the calculation of a Skipper's ranking.
  2. Only three (3) scores from Ranking Regattas held in a single region may be included for ranking purposes during an Event Cycle.
  3. A Skipper's rank shall include at least:
    • 1 (and no more than 2) USA National Championship Regatta(s),
    • 1 (and no more than 3) USA Regional event(s), and
    • 1 USA Annual Club Ranking Regatta (non-Regional and non-USA National Championship Regatta), which must be included in the top five (5) scores counted in calculating a Skipper's ranking.
  4. USA National Championship Regatta scores shall be given an additional 1.2x weight, USA Regional Championship Regatta shall be given a 1.1x weight and a USA Annual Club Ranking Regatta shall have a 1.0X weight.
  5. To be a Ranking Regatta and count towards a Skipper's ranking, a minimum of ten (10) boats must start a race during the regatta.
  6. All Ranking Regattas shall have a scaled point system with an initial base of 100 points for the 1st Place in a ten (10) boat fleet with the base increased by one (1) points for each additional participant.
  7. A Ranking Regatta's point value is driven by the number of starters as set forth in the following chart:

    # of starters: S1st Place Score: TP






  8. Scores will be rounded to the nearest whole number.

The ranking score for each participant utilizes the following formula in which:

TP = Total points (1st place Score) for the event based on the number of participants in the Ranking Regatta
S = # of starters (number of boats that actually participated in the Ranking Regatta)
F = Finishing position in the Ranking Regatta
Participant Ranking score = TP * ((S - F) + 1) / S

6. Tie breakers

  1. Finishing place in most recent USA National Championship Regatta.
  2. Finishing positions in the five (5) applicable regattas, i.e. most firsts, most seconds on down.
  3. Number of Ranking Regattas competed in.
  4. Coin toss by NCA Secretary.

The first three tie breakers shall only utilize Ranking Regattas within the Event Cycle.

7. RD Ranking points through "Event Redress"

  1. If requested in writing to the NCA Secretary within 30 days of a Ranking Regatta's start, the Race Director ("RD") and any other indispensable person necessary to the proper running of a Ranking Regatta as nominated by the RD, may be awarded average finish "redress", which will consist of the average of their finish positions at all Ranking Regattas they have participated in over the entire Event Cycle, which in turn will be converted to a "Redress Score" for the Ranking Regatta missed as calculated in Section 6. To be eligible for consideration of Event Redress, the person requesting such must have participated in at least five (5) other qualifying Ranking Regattas within the Event Cycle.
  2. Only one such Event Redress within the Event Cycle may be applied for the individual's total ranking score.
  3. The average score will be recalculated after every Ranking Regatta.
  4. Location of the Ranking Regatta shall be deemed as a race sailed within that Region.

8. "Event Redress" for US skippers at World Championship, Continental Championship(s), or other Restricted Event

  1. Just as a RD may request Event Redress for a Ranking Regatta he or she was unable to participate in due the active role he or she took in making the Ranking Event possible, so too can the US participants in the World Championship, Continental Championship(s) or other Restricted Events who are unable to attend certain Ranking Regattas in the US while preparing for or returning from a Restricted Event abroad, subject to the following rules. Any US Ranking Regatta occurring within thirty (30) days after the World Championship or within thirty (30) days before or after any Continental Championship or other Restricted Event may request "Event Redress" by requesting such in writing of the NCA Secretary within 30 days of the Ranking Regatta to be missed.
  2. The same rules for calculating the "Event Redress" score through an average of finish position, as described in section 8, shall apply.
  3. To be eligible for this "Event Redress", the Skipper must have at least five (5) finishes in other Ranking Regattas during the Event Cycle.

9. Expression of interest

  1. Expression of interest forms shall be available on the USA NCA website.
  2. The form shall announce a closing date by which all applications must be received.
  3. Forms received after this date will be placed on a waiting list.
  4. Within fourteen (14) days of the announced closing date for the receipt of Expression of Interest applications, the NCA Secretary will confirm and publish the entrants on the NCA web site.



To determine the Skippers to represent the United States in the 2013 World Championship Regatta, the USA IOM Class Ranking System will be modified as follows. These changes are applicable to the ranking of Skippers for the 2013 World Championship only. All other rules apply.

The applicable rules are replaced as follows:

4. Ranking Events

  1. The "Event Cycle" shall commence January 1, 2012, with the last qualifying event starting no later than six (6) months prior to the date of the Restricted Event.

5. Rank Scoring

  1. The top three (3) best results shall count towards a Skipper's Ranking.
  2. Up to three (3) events from a single region may be included for ranking purposes during an Event Cycle IF:
    1. The Skipper attends at least one Ranking Event out of their home Region, and
    2. The Skipper attends at least one USA Annual Club Ranking Regatta.
  3. A Skipper's ranking calculation shall include any combination of Ranking Events to yield the highest number of points, but weighting of these events as described in 5.d. shall be as follows:
    1. At least one result shall be weighted as a USA Annual Club Ranking Regatta (1.0X weighting) regardless of the event's title.
    2. No more than two USA Regional Championship Regattas shall be included in the Skipper's ranking calculation with the 1.1X weighting.
    3. Only one USA National Championship Regatta result shall be given 1.2X weighting; if two USA National Championship Regattas are held in an Event Cycle and both scores are to be used, one result shall have a 1.1X weighting applied to it for ranking purposes, subject to 5 c (i).
    4. If two (2) USA National Championship Regattas are held during an Event Cycle, the Skipper must participate in at least one of those Regattas to be considered for a ranking, regardless of whether that result will be used for Skipper Ranking calculations.

6. Tie Breakers

  1. Finishing positions in the three (3) applicable regattas, i. e. most firsts, most seconds on down.