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The Maritime Disciplinary Court of the Netherlands:

Focal Points Navigation > Sailing in an ice convoy with an icebreaker

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Multi Purpose General Cargo vessel > 3000 gt [4]

Sufficient manpower on the bridge and a clear division of tasks with regard to navigation, steering and keeping an eye on the distance to the other vessels.
Active communication between the vessels in the convoy.
The use of a variable range marker (VRM) and AIS data in the radar.
Crew members who are competent in ice convoy sailing, for example by taking an appropriate course.