GRKAS is affiliated with the following karate organisations.
Karate-Do Union of Singapore (KUS) is a non-profit organization that promote karate in Singapore. KUS strives to invest in karate athletes so that Singapore can be represented in the regional and the world karate arena.
Jitsueikai is a Goju-ryu karate training institution in Osaka, Japan.
Japan Karate Federation Goju-kai is a national governing body of karate in Japan.