32 FAA Chart Users Guide - VFR Symbology - Sectional and Terminal Area Charts Examlple: Los Angeles Example: Harrisburg, PA Isogonic lines and values shall  be based on the five year epoch  magnetic variation model. Local Magnetic Notes Unreliability Notes Intersections  Named intersections used as  reporting points. Arrows are  directed toward facilities which  establish intersection. By Request Site Rotating or Oscillating Isolated Location Rotating Light with Flashing Code  Identification Light Rotating Light with Course Lights and  Site Number NAVIGATIONAL AND PROCEDURAL INFORMATION AIRSPACE INFORMATION (Continued) VFR Transition Routes Appropriate notes as required may be shown. Uni-directional Bi-directional Bi-directional with NAVAID Ident  and Radial TRSA Name  TRSA Boundaries TRSA Sectors Appropriate notes as required may be shown. Terminal Radar Service Area (TRSA)  TAC only