Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.79101

(a) “Commission” means the Michigan state waterways commission created in part 781.  1

(b) “Harbor” means a portion of a lake or other body of water either naturally or artificially protected in order to be a place of safety for watercraft.

(c) “Harbor facilities” means the structures of a harbor constructed to protect the lake or body of water and the facilities provided within the harbor and on shore for the mooring and servicing of watercraft and the servicing of crews and passengers.

(d) “Marina” means a site which contains harbor facilities.

(e) “Nonrevenue-producing harbor facilities” means any portion of harbor facilities that would not normally produce revenue and includes, but is not limited to, jetties, breakwaters, dredging, and shore protection.

(f) “Revenue-producing harbor facilities” means any portion of harbor facilities that normally produce revenue and includes, but is not limited to, watercraft slips, watercraft launching facilities, watercraft storage, lodging, access roads, watercraft repair facilities, parking lots, mechanical haul-out devices, and facilities for fuel, food, and other services.

(g) “Watercraft” means any contrivance used or designed for navigation on water, including, but not limited to, any vessel, ship, boat, motor vessel, steam vessel, vessel operated by machinery, motorboat, sailboat, barge, scow, tugboat, and rowboat.