Md. Code Ann., Tax-Prop. § 7-231 — § 7-231

(a) As used in this section, “vessel” includes a ship, boat, or watercraft.
(b) A vessel is not subject to valuation or to property tax if the vessel is:
(1) not more than 100 feet in length; or
(2) regularly used in whole or in part in commerce outside the State.