The location and boundaries of said districts are shown on the Zoning District Map, Town of Milton. Said map, together with all explanatory matter thereon and all amendments thereto, is hereby adopted and is declared to be an appurtenant part of this chapter. Said map shall be kept up-to-date and shall be located in the Town Clerk's office for the use and benefit of the public. Certified copies of said map shall also be on file in the offices of the Town Planning Board, Zoning Board of Appeals, Zoning Enforcement Officer and Code Enforcement Official.