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A Flight Instructor's Journal: More Audio Panels Demystified
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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).
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MARKER GENERATORS AND CALIBRATORS
ios - Detecting a low frequency tone in an audio file - Stack Overflow
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Marker Beacon (Instrument) | IVAO Documentation Library
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Marker beacon | Article about marker beacon by The Free Dictionary
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A simple 10Ghz frequency marker
