Sea areas where vessels should listen to  information provided (Act on Port Regulations)

Vessels of 50m in length and upwards navigating in the sea areas defined by Maritime Traffic Safety Law and
Vessels of over 500G/T navigating in the sea areas defined by Act on Port Regulations should listen to
information provided by Osaka Wan Vessel Traffic Service Center (Osaka MARTIS).
In addition advice to alter course or take another necessary action may be issued to these vessels whenever
necessary to prevent danger.
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