The Associated Marine Officers' and Seamen's Union of the Philippines (AMOSUP-PTGWO) is the largest seafarers' union in the country with over 100,000 members, continues and improves on the legacy of Captain Gregorio S. Oca, known as "the Father of Modern-Day Filipino Seafarers," who established the Union on 11 November 1960 with the aim of uniting all Filipino Seafarers and working for the social, legal and moral rights of its members.
AMOSUP works towards securing fair wages and employment terms, benefits and healthcare for its members. It has created free healthcare access at the seaman's hospital, and a clinic in Pangasinan, through the Family Medical and Dental Plan. AMOSUP offers supported quality living in its 300 capacity Sailors home, as well as a Widow/er Survivorship Pension Fund and other welfare programs.
AMOSUP offers world-class maritime education through Maritime Academy of Asia and the Pacific (MAAP) which it established in 1998. It offers four-year baccalaureate maritime programs and maintains its own training vessel, the T/S Kapitan Felix Oca; through its Seamen's Training Centre and Professional Career Development Centre AMOSUP promotes career advancement and licensing of qualified seafarers. AMOSUP supports the continuing growth and development, stability of employment, and welfare of the Filipino Seafarer and his family.