The data-link clearance dialogue box is used to calculated, assign, and optionally communicate, IFR flight-plan clearances.
Callsign - will be automatically completed based on the selected target.
Cleared to - will be automatically completed as the destination airport from the flight-plan of the selected target.
Runway - the drop-down list allows selection of the departure runway. If that departure runway has been specified in the ATIS for the departure airport, then this will be used by default.
SID - once the runway has been specified, the SID will be calculated based on the flight-plan using data in the FIR DEF. In the event that more than one SID matches the departure airport/runway, adropdown is available next to the SID field where the correct SID can be selected. Please note that FIR DEFs may include SIDs which are dependant on multiple conditions, such as aircraft type, time-of-day, and available equipment.
Transition - not used in the current version of IVAC2.
Squawk - the controller may manually enter the 4-digit transponder squawk code to be assigned to this target.
Next Freq - the frequency which the pilot of the target aircraft should contact after receiving their clearance; use the drop-down list of available controllers to make the selection. Select yourself if you wish the pilot to remain on your frequency.
Departure - will be automatically completed as the departure airport from the flight-plan of the selected target.
ATC RMK - this can be optionally completed with any additional text which you require to be included with the clearance, e.g. Initial Climb.
CLD - this text is gradually built-up as data is input into the dialog; it represents the actual transmission which will be made to the target when clicking the SEND DCL button.