5.2.1.7.1.2 The unit or service shall be identified in accordance with the table below except that the name of the location or the unit/service may be omitted provided satisfactory communication has been established.
| Unit/service available | Call sign suffix |
| area control centre (without radar) | CONTROL |
| approach control (arrival and departure control service without radar) | APPROACH |
| approach control radar arrivals | ARRIVAL |
| approach control radar departures | DEPARTURE |
| aerodrome control (responsible for take-off, landing and aicraft in the CTR) | TOWER |
| surface movement control (responsible for all movements on the airport except the apron) | GROUND |
| radar, in general (enroute services) | RADAR |
| precision approach radar (guidance on final using specialized radar antennas) | PRECISION |
| direction-finding station | HOMER |
| flight information service | INFORMATION |
| clearance delivery (transmission of enroute clearances) | DELIVERY |
| apron control (aircraft guidance on the apron by the airport operator) | APRON |
| company dispatch (transmission of flight regularity messages of aircraft operating agencies) | DISPATCH |
| aeronautical station | RADIO |
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This question has appeared on the real examination, you can find the related countries below.
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Austro Control1
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Poland1