Dredging Or Underwater Operations
Dredging or underwater operations A vessel engaged in dredging or underwater operations, when restricted in her ability to manoeuvre Dredging or underwater operations, shorter than 50 m, not making wayAhead, day signsAheadAsternDredging or underwater operations, shorter than 50 m, making wayAhead, day signsAheadAsternDredging or underwater operations, longer than 50 m, making wayAhead, day signsAheadAstern