Gerakan Pramuka Indonesia ("Indonesian Pramuka Movement") is the national scouting organization of Indonesia. Scouting was founded in the Dutch East Indies in 1912, and Indonesia became a member of the World Organization of the Scout Movement (WOSM) in 1953. Its membership is compulsory for students. It has 21,599,748 members (as of 2011), making it the world's largest Scout association. Each year 14 August is celebrated as Pramuka Day to honour the organisation's first public parade in 1961, wherein independence hero Sultan Hamengkubuwono IX of Yogyakarta was appointed as the first Chief Scout of the GPI.