Marker Audio And Volume - Garmin GTN 725 Pilot's Manual

2.2.6

Marker Audio and Volume

The optional Marker Beacon Receiver uses an audio indicator to alert you
when the aircraft passes over a Marker Beacon transmitter. The audio from the
Marker Beacon Receiver can be heard unless disabled by selecting Marker Audio.
When Marker is selected (green bar shown), the tones for Marker Beacons are
heard. When Marker is not selected (green bar not shown), the tones for Marker
Beacons are not heard.
The GMA 35 marker beacon receiver and indicators are part of the ILS system.
The marker beacon lamps operate independently of any audio selection and
cannot be turned off. The GMA 35 can drive external marker lamps if required
and also provides an autopilot middle marker sense output.
Prior to beginning an ILS approach, select high or low marker sensitivity with
the Marker Hi Sense key. The lighted green bar in the key illuminates for high
sensitivity and remains off for low sensitivity.
Touching the Marker Audio key prior to an approach allows the marker
audio tones to be heard in the headsets. When the green bar in the Marker
Audio key shows, the marker audio will be heard when available. The Audio
Panel key will change to a Mute key. Touching the Mute key while audio is
heard will mute the marker audio until the next beacon is received. The marker
beacon signal sensitivity threshold can be set in Configuration mode. Contact a
Garmin-authorized service center for adjustment.
1. While the Audio Control page is displayed, touch the Marker
Audio key to hear the current Marker Beacon tones.
2. Touch the Marker Audio key again to disable Marker Beacon
tones.
3. Touch the Marker Volume key to set the Marker Beacon
tone volume. Touch the Marker Volume arrows to set the
volume.
Percent Of Maximum Volume
Touch To
Decrease Volume
Figure 2-17 Audio Panel Marker Beacon Tone Volume Selection
190-01007-03 Rev. D
Graphic Scale Showing Volume
Garmin GTN 725/750 Pilot's Guide
Touch To
Increase Volume
2-13
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