Travelling downstream, you see the prescribed blue-board meeting indication on an upstream vessel's starboard side. What must you avoid?
Short answer
Treating it as unconditional priority or beginning a starboard-to-starboard pass before the full indication, response and water agree
The display communicates a specific upstream offer and downstream response for a starboard-to-starboard meeting; it does not create priority or safe water. Speaker, side, response and scope must remain intact. Revisit The Blue-Board Meeting Exception.
Sources and scope
Reviewed by Richard Moore on . This answer is scoped to european inland waterways; local rules still apply; check the current chart, publication, local rules and official operational guidance before acting afloat.
Quick check
Travelling downstream, you see the prescribed blue-board meeting indication on an upstream vessel's starboard side. What must you avoid?