On passing a radio callin-in point or crossing a defined line vessels are required to report on VHF to a Traffic Control Centre. The attribute 'orientation' (ORIENT) encodes the orientation of the traffic flow at that point.
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Radio calling-in points are established in certain busy waterways and port approaches to assist traffic control.
On behalf of the IHO Member States, the International Hydrographic Bureau would like to thank Korea Hydrographic and
Oceanographic Agency(KHOA) of the Republic of Korea for giving active support in the development of the S-100 GI Registry