19. ELIGIBILITY CODE ISAF Eligibility Rules 19.1 A competitor whose ISAF eligibility has been suspended or revoked shall not engage in any competition in the sport of sailing. 19.2 To be eligible to compete in an event listed in 19.3, a competitor shall: (a) be governed by the regulations and rules of ISAF; (b) be a member of his/her Member National Authority or one of its affiliated organizations.
Events Requiring ISAF Eligibility 19.3 ISAF Eligibility is required for the following events: (a) the sailing regatta of the Olympic Games; (b) the sailing regattas of Regional Games recognized by the International Olympic Committee; (c) events including “ISAF” in their titles; (d) world and continental championships of ISAF classes and world championships of the IMS, Major Events and other events approved by ISAF as a World Championship;
Technically true, however the NOR's for the last two 16 NA's have required MNA membership. Not that we've enforced it.