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Dredging or underwater operations with an obstruction

Technical visualDredging or underwater operation with an obstruction
Dredging or underwater operation with an obstructionA dredger shows red-red and two balls on the obstructed side, and green-green and two diamonds on the side where the obstruction does not exist.RAMRAMRAMobstructed sideobstructed sideclear sideclear sideOBSTRUCTEDCLEAR SIDE
Dredging or underwater operation with an obstructionA dredger shows red-red and two balls on the obstructed side, and green-green and two diamonds on the side where the obstruction does not exist.123451RAM2obstructed side3clear side4OBSTRUCTED5CLEAR SIDE

Dredging or underwater operation with an obstruction

Rule 27: the green side marks the side without the obstruction; it does not remove other collision-avoidance duties.

In addition to RAM signals:

Obstructed side

two all-round red lights vertically

or two balls by day

Side on which another vessel may pass

two all-round green lights vertically

or two diamonds by day

Meaning

Do not infer that green means permission to pass regardless of circumstances. It marks the side on which the obstruction does not exist.

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