Garmin GMA 350 Pilot's Guide - Page 11

GMA 350 Audio Panel MARKER BEACON RECEIVER The marker beacon receiver detects any marker beacon signal within the reception range of the aircraft. When a marker beacon signal is detected, the lamps illuminate, and an associated keyed-tone is heard when MKR audio is selected. Marker beacon lamps operate independently of any audio selection and cannot be turned off. Marker Beacon Key & Lamps The marker beacon signal sensitivity threshold can be set to High, Low, or User Selectable (toggle switch required). The receiver detects the three marker tones (outer, middle, and inner). Audio Frequency 400 Hz (Outer) Audio Keying Lamp Actuated Blue 1300 Hz (Middle) Amber 3000 Hz (Inner) White The GMA 350 provides three states of marker beacon operation; On, Muted, and Deselected. The MKR/MUTE key annunciator indicates when marker beacon audio is selected. Marker beacon audio is not heard when the annunciator is off or when the annunciator is on with the marker beacon audio muted. 190-01134-12 Rev. C Garmin GMA 350 Pilot's Guide 11