CALL UP- Initial voice contact between a facility and an aircraft, using the identification of the unit being called and the unit initiating the call.
The call up consists of the name of the facility, his full aircraft call sign and his altitude. Every radar specialist is required to obtain an aircraft's altitude at least once so most want to do it on first contact.
To contact ATC, if there is any doubt15 about what frequency to use, call up on 121.5 MHz. Practically every ATC facility can receive and transmit on that frequency.
Most GPS units offer some variation on several core functions: the ability to fly direct from your present position to a waypoint, the ability to enter a flight plan route, and the ability to call up the nearest airport, navaid, service, ...
When flying IFR, or by instruments, an aircraft is automatically under ATC control and needs not to request radar flight following. In order to obtain radar flight following the pilot needs to call up the approach or departure controlling agency for ...
 See also: Clearance, Expect, Direct, Section, Flight plan
  
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