54 NAVIGATIONAL AND PROCEDURAL INFORMATION VFR Checkpoints Underline indicates proper  name of VFR Checkpoint. Obstruction Above 299’ and below 1000’ AGL 1000’ and higher AGL High-Intensity Obstruction Lights High-intensity lights may operate  part-time or by proximity activation. Navigation Data VFR Waypoints Stand-Alone Collocated with VFR Checkpoint Collocated with VFR Checkpoint  & Reporting Point  Group Obstruction Above 299’ and below 1000’ AGL 1000’ and higher AGL Wind Turbine Farms When highest wind turbine is unverified, UC will be shown  after MSL value. Maximum Elevation Figure (MEF) (see VFR Terms tab for explanation) FAA Chart Users’ Guide - VFR Chart Symbology - Helicopter Charts