Inquiry-based learning in the marine sciences, with a strong emphasis on geosciences, has been the focus of a unique program at the University of Hawaii – the Marine Option Program (MOP). For three decades this program has provided undergraduate students with pathways to partnerships in every field of the oceanographic world, with an emphasis on inquiry-based learning. An extensive array of partnerships has developed with academic institutions, industry, state and federal government agencies, and more. MOP is an academic certificate program at the university (equivalent to a minor) and the successful completion of the program is noted on transcripts. Course requirements are coupled with either a research project or an internship for the MOP certificate, the project or internship providing experiental education guided by a mentor. Primarily aimed at undergraduates in geology, geophysics, geochemistry, biology, botany, engineering, Pacific studies, art and education, the program also has involved graduate students in law, maritime history, and underwater archaeology – the mix encourages interaction between students, faculty and mentors with extensive interdisciplinary blending of student interests. Summer programs involve training in both underwater mapping, via diving and boat surveys, and onland watershed mapping using GIS-based programs. Outreach activities extend to the local community and into the Pacific basin. MOP is active on six University of Hawaii campuses on three islands. An estimated 8000 students have been active with 632 certificates awarded since 1971. The success of the program is measured by its graduates who occupy key positions in the world of marine sciences and affairs, especially in Hawaii, thereby forming a critical part of the partnering activities for inquiry-based learning.