Avidyne IFD540 Pilot's Manual page 13

 Frequency (Active
button;
 USB
downloads, software updates and powering USB
devices in-flight;
Four (4) Line Select Keys (LSKs) that are page

dependent with soft key labels adjacent to each;
 Dual Concentric Rotary Knob as a means of
manually tuning Com and Nav frequencies;
 Three (3) Page Function keys along the bottom
(FMS, MAP, AUX);
 Mechanical Cam Latch control for tray installation;
 Dual Concentric Rotary Knob that is page
dependent;
 Six (6) Dedicated Function Keys consisting of:
o
o
o
o
o
o
 Ambient Light Sensor;
 CDI Nav Source knob.
System Overview
port for database
Direct-To ("-D->")
Procedure ("PROC")
Nearest ("NRST")
Frequency List ("FREQ)
Enter ("ENTR")
Clear ("CLR")
1-7
Standby) Swap dedicated
updates, datalog