. Elapsed time or countdown time when in TIMER mode. ) The top center part has an indicator which shows ‘OBS’ when the system is in ACTIVE/CDI
mode.
) The lower part shows this information:

.
The course deviation indicator when in ACTIVE/CDI mode and the active frequency is tuned to a VOR or localizer frequency.

.
'FLAG’ when the signal received is too weak for the system to display accurate information.

) NAV frequency transfer/TIMER button. Push this button to move the active frequency to standby and the standby frequency to active when in VOR mode. When in timer mode you push this button to set or reset the timer.
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) PULL OBS switch. The PULL OBS switch is the inner FREQUENCY SELECT knob. If you pull this knob out you can use the inner FREQUENCY SELECT knob to select the OBS course. When this knob is pulled the OBS indicator in the top center of the NAV display flashes.
) PULL IDENT knob. Pull the PULL IDENT knob to hear the usual voice communications on the audio system and to hear the station IDENT tone on the audio system. Push the knob to hear the usual voice communications on the audio system but not hear the IDENT tone. Turn this knob to adjust the volume of the voice communications or IDENT tone.
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% Figure 4: Garmin GNS 430 NAV/COM/GPS % %

% Figure 5: Garmin GNS 530 NAV/COM/GPS %
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% C. GNS 430/530 NAV/COM
% Figure 4 shows the GNS 430 NAV/COM/GPS system. Figure 5 shows the GNS 530 % NAV/COM/GPS system. They are located in the avionics rack in the instrument panel, see Chapter % 31.
% The GNS 430/530 has these functions:
%) Two-way voice communication in the frequency range from 118 MHz to 136.975 MHz in 25 kHz % or 8.33 kHz increments (depends on setup). This gives 760 or 2278 communication channel % operation.
%) Receiving navigation signals in the frequency range from 108 MHz to 117.95 MHz in 50 kHz % increments. This gives 200 navigation channel operation.
%) Receiving glideslope signals in the frequency range from 329.15 MHz to 335 MHz in 150 kHz % increments.
% The GNS 430/530 has the communication and navigation controls on the left. They have these % controls:
%) The small left knob (PUSH C/V) (1) is used to tune the kilohertz (kHz) value of the standby % frequency for the communications transceiver (COM) or the VLOC receiver, whichever is % currently selected by the tuning cursor. Press this knob momentarily to toggle the tuning cursor % between the COM and VLOC frequency fields.
%) The large left knob (COM/VLOC) (2) is used to tune the megahertz (MHz) value of the standby % frequency for the communications transceiver (COM) or the VLOC receiver, whichever is % currently selected by the tuning cursor.
%) The VLOC volume knob (3) controls audio volume for the selected VOR/Localizer frequency. % Press momentarily to enable/disable the ident tone.
%) The VLOC flip-flop key (4) is used to swap the active and standby VLOC frequencies (i.e., % make the selected standby frequency active).
%) The COM power/volume knob (5) controls unit power and communications radio volume. Press % momentarily to disable automatic squelch control.
%) The COM flip-flop key (6) is used to swap the active and standby COM frequencies. Press and % hold to select emergency channel (121.500 MHz).
% The GNS 430/530 display is divided into separate 'windows' (or screen areas), including a COM % window, VLOC window and the GPS window (the right 3/4 of the display).
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D. COM 1 Antenna
The COM 1 antenna (Comant DM C63-1/A) is mounted on the upper surface of the fuselage, aft of the cockpit.
　
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