Transfer Of Control
When ac move from one UIR to another (specifically from Europe to the UK), they presumably remain under Radar Control, with control being transferred from one agency/controller to the next. I have two questions:
1. How is the actual transfer of control achieved (do controllers talk? Is it done electronically? Procedurally?).
2. Do airliners carry radios that switch automatically (as has been intimated by some pilots I have spoken to) or do these radios require pilot input? If so, what triggers the change?
Many thanks for any help out there.
Regards
STH