Garmin G1000 Mooney M20TN - Manual (Page 101)

190-00647-00 Rev. A Garmin G1000 Pilot’s Guide for the Mooney M20M/M20R/M20TN 4-21
AUDIO PANEL AND CNS
MARKER BEACON RECEIVER
NOTE: The marker beacon indicators operate independently of the marker beacon audio and cannot be
turned off.
The Marker Beacon Receiver is used as part of the ILS. The Marker Beacon Receiver is always on and detects
any marker beacon signals within the reception range of the aircraft.
The receiver detects the three marker tones, outer, middle, and inner, and illuminates the marker beacon
annunciations. The marker beacon annunciations are located to the left of the altimeter on the PFD.
Outer Marker Indication Middle Marker Indication Inner Marker Indication
Figure 4-27 Marker Beacon Signal Annunciators on the PFD
IM OM MM
Figure 4-28 Marker Beacon Keys
The Audio Panel provides three different states of marker beacon operation; on, muted and deselected.
Pressing the MKR/MUTE Key selects and deselects the marker beacon audio. The key annunciator indicates
when marker beacon audio is selected.
During marker beacon audio reception, pressing the MKR/MUTE Key mutes the audio but does not affect
the marker annunciators (Figure 4-27). The marker tone is silenced, then waits for the next marker tone. The
MKR/MUTE Key annunciator is on, indicating audio muting. The audio returns when the next marker beacon
signal is received. If the MKR/MUTE Key is pressed during signal reception (O, M, I indication) while marker
beacon audio is muted, the audio is deselected and the MKR/MUTE Key annunciator is extinguished.
Pressing the HI SENS Key selects increased marker beacon signal sensitivity. The HI SENS function is used
to receive an earlier indication when nearing a marker during an approach. Pressing the HI SENS Key again
returns to low sensitivity operation.