mercantile marine college
Refers to a specialized higher education institution for training merchant marine officers. Now often reorganized into maritime faculties of universities.
He graduated from a mercantile marine college and became a navigating officer.
海事大学 is a broader term for maritime universities, while 商船大学 specifically refers to institutions focused on merchant marine training.
Compound of 商船 (merchant ship) and 大学 (university).