C stands for Clearance Limit. This is also known as your destination airport. Say I was at Portland International (KPDX) and I was flying to Seattle-Tacoma International (KSEA). The beginning of the IFR Clearance would be:
"Horizon 69 is cleared to Seattle Airport-"
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Flight Sim Tips - C.R.A.F.T: Copying IFR Clearances
Non-FictionA simple way to copy IFR clearances!