Sailing Number
In accordance with RRS46 AS Prescriptions, all persons on board a boat while racing shall be members of a Club affiliated to Australian Sailing and have an Australian Sailing number, or hold a valid Sail Pass, or if an international competitor, be a member of club affiliated to a World Sailing recognised Member National Authority.
LMYC offers a Social Crew Membership for $9.99 for 1 year or $27.50 for 3 years which includes an Australian Sailing Number - https://www.lmyc.com.au/membership/
If you have a Sailing Number but don't know it search for it here - https://www.sailing.org.au/member-finder