I have heard at least Canadian CG call that indicated the relative position of the offending open mike. I am wondering if they expected those who heard to check their mike and to check with other boats in the vicinity.
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)