The spiritual and ideational work of the German Maritime Institute (DMI) is supported by its members. Those members can be private people, corporations/unions of people and juridical people. They become members by invitation/request of the executive board. Ever since 1973 the members include personalities from the fields of science, politics, economics as well as naval officers. The members engage in working for the German Maritime Institute. Some members fulfil practical tasks for DMI and thereby help implementing the institutes’s project actively. Other members work hard to conjure the public's interest in maritime matters by publishing scientific texts on maritime issues. Still others support the institute by donating money and respectively by collecting the necessary donations.

The annual members' meeting decides on the annual-, business-, and financial report as well as on the discharge, election and the applications of the executive board.