The boundaries of the zoning district shall be determined and defined or redefined from time to time by the adoption of zoning district maps covering the town showing the geographical area and location of the zoning district. Each change made in accordance with this code shall be made on the official zoning map promptly after the amendment has been adopted, together with an entry on, or attached to, the official zoning map, as follows:
Each change shall be signed by the mayor and attested by the town clerk-treasurer.