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GROUND COMMUNICATIONS OUTLET
GROUND COMMUNICATIONS OUTLET (GCO):
USA: An unstaffed, remotely controlled ground / ground communications facility. Pilots at uncontrolled airports may contact ATC and FSS via VHF to a telephone connection to obtain an instrument clearance or close a VFR or IFR flight plan. They may also get an updated weather briefing prior to takeoff. Pilots will use four “key clicks” on the VHF radio to contact the appropriate ATC facility, or six “key clicks” to contact FSS. The GCO system is intended to be used only on the ground.
source: ICAO Aviation Chart Glossary
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