Garmin GDU™ 37X Pilot’s Guide190-01054-00 Rev. E 55GPS Navigation Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices IndexMap Setup Page (Airspace Category) Map Setup Page (SUA Category)AIRWAYSLow Altitude Airways (or Victor Airways) primarily serve smaller piston-engine,propeller-driven airplanes on shorter routes and at lower altitudes. Airways are eightnautical miles wide and start 1,200 feet above ground level (AGL) and extend upto but not including 18,000 feet mean sea level (MSL). Low Altitude Airways aredesignated with a “V” before the airway number (hence the name “Victor Airways”)since they run primarily between VORs.High Altitude Airways (or Jet Routes) primarily serve airliners, jets, turboprops, andturbocharged piston aircraft operating above 18,000 feet MSL. Jet Routes start at18,000 feet MSL and extend upward to 45,000 feet MSL (altitudes above 18,000 feetare called “flight levels” and are described as FL450 for 45,000 feet MSL). Jet Routesare designated with a “J” before the route number.Low Altitude Airways are drawn in gray. High Altitude Airways are drawn in green.When both types of airways are displayed, high altitude airways are drawn on top ofLow Altitude Airways.When airways are selected for display on the map, the airway waypoints (VORs,NDBs, and Intersections) are also displayed.
