Outer marker hi-res stock photography and images - Alamy
Marker Beacon System * Function The marker beacon system is a radio navigation aid which determines the distance between the aircraft and the runway threshold. The system provides visual and aural indications
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Outer VHF Marker Beacon - YouTube
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Garmin function question (marker beacons) - General Discussion - Microsoft Flight Simulator Forums
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ATPL Theory - Marker Beacons Marker Beacons are stations on the ground. When you fly overhead they will let you know by means of a visual or a sound (can be both).