Garmin 347 Pilot's Manual page 11

Pressing the PLAY key plays back the most
recent message. Pressing the PLAY key again
stops that message and skips to the next preceding
message. The MKR/MUTE key cancels the playback. In Split-
COM mode, the pilot' s or the copilot' s COM audio is recorded
and played back to the selected headset.
Transceivers
NOTE: Audio level is controlled by the selected COM
radio volume control.
Pressing COM1 MIC, COM2 MIC, or
COM3 MIC key selects the transmitter and
receiver audio for the selected transceiver source.
The active com audio is always heard on the head-
phones.
Also, each audio source can be selected
independently by pressing the COM1, COM2
or COM3 receiver keys. When selected this
way, they remain active as audio sources regardless of which
transceiver has been selected for microphone use.
190-00325-00 Rev. A
When a microphone is keyed, the active transceiver' s MIC
key LED blinks approximately once per second indicating that
the radio is transmitting.
Split Com and PA Mode
Pressing the COM 1/2 key activates the Split
COM mode. In this mode the pilot uses COM
1 for MIC audio while the copilot uses COM
2. The pilot and copilot can transmit simul-
taneously over separate radios. The pilot can
still listen to COM 3, NAV 1, NAV 2, DME, ADF and MKR as
selected. The Split COM mode is cancelled by pressing the
COM 1/2 key a second time.
When in the Split COM mode the copilot may make PA
announcements while the pilot continues using COM 1 indepen-
dently. PA mode is entered by pressing and holding the SPKR
key for two seconds while in the Split COM mode. The copilot' s
voice is then heard over the cabin speaker when keyed. A second
press of the SPKR key returns the copilot to normal Split COM
operation.
Garmin GMA 347 Pilot's Guide
Operation
9