The international J/80 class rules as used during our Belgian races:
J/80's are declared as "Sportkieljacht" if used like described here.
MB Verplichte uitrusting pleziervaart Bijlage 4
Learn to sail on J/80 and join as crew during races:
Sport Vlaanderen (-18j): Sportkamp
VYN: Vlaamse Vaarschool
KYCN: Sailing Academy