Boat storage. Onekama Marine (Onekama) - Premier new and made use of boat profits, dealers and brokers, services and storage. Boat storage. Marine Tech (Benzonia) - Repair service of all marine merchandise, as effectively as storage inside, outdoors. Long Lake Marina (Interlochen) - Full assistance boat dealer, including boat income, repair, and storage and serve all of Northern Michigan, from Cadillac to Mackinaw City.