Avidyne IFD540 Pilot's Manual page 82

Map Symbol
3-6 Map Pages
Item
Flight plan, course
waypoints
Interstate highway
Class B
Class C
Tower Zone
(estimated Class
D)
Victor or Jet
Airways
Terrain scale
Description
Each waypoint in flight
plan
All interstate highways in
the database
Each boundary of Class
B airspace
Each boundary of Class
C airspace
Tower zone boundary if
known, otherwise 5nm
ring estimating Class D
boundary
All Victor and/or Jet
airways
Indicates highest and
lowest limits of the terrain
in displayed area.
Legend colors in
between these numerics
represent terrain
elevations. Blue
obstacle clearance
number shows the top of
the highest obstacle,
when greater than the
highest displayed terrain.