Join The Best Maritime Courses after 10th GP Rating Course Mumbai GP Rating infers General reason Rating. GP Rating candidates are the people who have been set up in both Deck and Engine Room errands. Such examinations may be used either in deck office or Engine office according to the necessities of the association. They perform errands related to Seamanship, Cargo dealing with, Maintenance tackle deck, Operation and upkeep of Machinery. This Course ensured higher employability of the Indian seafarers in world market.