This title shall consist of the text hereof as well as that certain map identified by the approving signatures of the Governing Body, marked and designated as "zoning map", which said map, together with three (3) copies thereof, is now on file in the Office of the City Clerk. Said map has been heretofore examined in detail by the Governing Body, has been made available to the public at public hearings and is hereby adopted as a part of this title, but this title and said map shall be subject to change from time to time as may be determined by the Governing Body. (1984 Code § 5-1-2)