Juridically, yeah. But that shouldn't affect how Wesley assesses the tactical situation at hand. If a ship is about to run aground because of a faulty route marker, the concern of the eyewitness should be the marker, rather than the skipper's theoretical responsibility.
In that example, if the witness were able to communicate with whomever had the conn of the ship, it would be imperative to let that person know what was happening. Wesley was in communication with the person most likely to be able to address the tactical situation, Kirk, and he made himself known. He may have said it in kind of a dickish way, yes, but that's a personal issue.