What does a blue board with a white scintillating light normally indicate on CEVNI waterways where it is used?
Short answer
A request or indication for starboard-to-starboard passing
The blue board/white scintillating light is an inland passing signal. It must be understood in the local traffic context.
Quick check
What does a blue board with a white scintillating light normally indicate on CEVNI waterways where it is used?