MORSE CODE ISOGONIC LINE AND LOW/HIGH CHARTS VALUE ENLARGEMENT AREA TIME ZONE  All time is Coordinated Universal Time (UTC) During periods of Day - lights Savings Time (DT),  effective hours will be one  hour earlier than shown.  All states observe DT ex - cept Arizona and Hawaii MATCH MARK LOW/HIGH CHARTS HYDROGRAPHY SHORELINES TOPOGRAPHY TERRAIN Area Charts CULTURE Boundaries LOW/HIGH ALTITUDE International U.S./Russia Maritime Line  LOW/HIGH ALTITUDE Date Line  LOW/HIGH ALTITUDE Navigational and Procedural Information (Continued) FAA Chart Users’ Guide - IFR Enroute Symbology 89