It was then that Prince Sadanaru became an honorary member of The Empire of Japan Marine Rescue Japan (In Japanese, Dai Nihon Teikoku Suinan kyusai Kai; currently, Marine Rescue Japan) and Nippon Kaiji Kyokai (also known as NK or ClassNK).
大日本帝国水難救済会名誉会員、海事協会名誉会員。