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Old 20th Feb 2005, 11:58
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rotatrim
 
Join Date: Jul 2004
Location: UK
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121.5 "On Guard"
Listening to 121.5, I sometimes hear aircraft from the same company calling each other using the phrase "Callsign ABC Callsign XYZ on guard - how do you read" or something similar. What's the purpose of that?
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