Garmin G900X Pilot's Manual page 182

GPS NAVIGATION
Airway Line Style
Low altitude airways are drawn in gray (the same shade used for roads). High altitude airways are
drawn in green. This color is used on Jeppesen charts where high altitude airways are shown on low
altitude charts. When both types of airways are selected for display at the same time, high altitude
airways is drawn on top of low altitude airways.
Airways which are classified in the database as all altitude routes are drawn as high altitude routes
whenever both route types are selected for display at the same time. Otherwise, these routes are drawn
in the style (low or high) that has been selected for display.
When airways are drawn on the map, the symbols needed to show the airway waypoints (VORs, NDBs
and Intersections) are also drawn regardless of the map setting that would otherwise control the drawing
of that symbol. For example, if airways are enabled to be drawn at the 200 nm range setting, Intersection
symbols are drawn as needed to depict the airway even though Intersections are enabled for display only
for range settings of 30 nm or less.
5-24
Figure 5-16 High and Low Altitude Airways
Garmin G900X Pilot's Guide 190-00726-00 Rev. A