The Town Clerk shall be the custodian of this Zoning Chapter and zoning map or maps created thereunder. The Chair of the Planning Board shall be responsible for maintenance and update of the text and zoning map comprising this chapter. Changes which impact the zoning map shall be depicted on the map within 90 days of such authorized change(s). The Planning Board shall be responsible for review of this chapter annually, and whenever changes are made to the Comprehensive Plan of the Town, to identify any changes necessary and forward these changes to the Town Council.