Power-driven vessel, less than 50 m

in length, busy with dredging or underwater operations walkie-talkies and

limited in the ability to maneuver. Goes to the right. There is an obstacle on

the starboard side.

Power-driven vessel, less than 50 m

in length, is engaged in a towing operation that makes it is impossible for him

to deviate from his course. Goes on us. The length of the tug is less than 200

m.

A power-driven vessel is engaged in

such a tug an operation that makes it impossible for him to deviation from your

course.

A power-driven vessel constrained by its draft.

Goes to the

left.