The use districts described herein are bound and defined on an official zoning map or maps that deal with the distinct areas of the city and are entitled “Zoning Map of the City of Gig Harbor, Washington.” Copies of the zoning map are on file in the office of the planning director. These maps are incorporated as a part of this title as if the districts were described in detail in written descriptions in the title. (Ord. 573 § 2, 1990).