Garmin GTN 625, Flight Manual

Page: 41 / 49

190-01007-A2 Rev. 6 AFMS, Garmin GTN GPS/SBAS System
Page 34
7.11 External Switches
External switches may be installed and interfaced to the GTN. These switches
may be stand alone, or integrated with a TAWS or GPS annunciator. Table 4
lists the switches and function they perform:
Switch Label Function
CDI Toggles between GPS / VLOC sources. This
switch may be part of an external annunciator
panel.
COM CHAN DN Toggles down through the preset com
frequencies.
COM CHAN UP Toggles up through the preset com frequencies.
COM RMT XFR Transfers the COM active / standby frequencies.
NAV RMT XFR Transfers the NAV active / standby frequencies.
OBS Performs an OBS or SUSP function. This switch
is part of an external annunciator panel and is
placarded with the following
: “ Green OBS
indicates OBS or SUSP mode – GTN
annunciator bar indicates which is active. Push
OBS button to change OBS or SUSP mode.”
OBS/SUSP Performs an OBS or SUSP function.
TERR INHB Toggles the TAWS Inhibit function on/off. This
switch is part of an external annunciator panel.
The terrain display is still presented if TAWS is
Inhibited.
PTC Push-to-Command switch for Voice Command
input to the GMA and the GTN.
Table 4 – External Switches
7.12 Airspace Depiction and Alerts
The GTN aides the flight crew in avoiding certain airspaces with Smart Airspace
and airspace alerts. Smart Airspace de-emphasizes depicted airspace that is not
near the aircraft’s current altitude. Airspace Alerts provide a message indication
to the flight crew when the aircraft’s cur rent ground track will intercept an
airspace type that has been selected for alerting.
NOTE
Smart Airspace and Airspace Alerts are separate features.
Turning on/off Smart Airspace does not affect Airspace
Alerts, and vice versa.