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Compulsory pilotage is applicable to all ships of foreign nationalities .

所有外国籍船舶均实行强制引航.

Pilotage is compulsory in hong kong waters .

领航在香港水域是强制性的。

Article 4 the division and alteration of the pilotage districts shall be stipulated by motc .

第4条（引水区域之划分变更）引水区域之划分或变更，由交通部定之。

Pilotage of ships of any length to and from buoys and anchorages at any time and the berthing and unberthing of ships of any length to and from wharves , berths , docks and piers at any time .

于任何时间为任何长度的船舶领港，前往和离开浮标及碇泊处，以及于任何时间将任何长度的船舶停泊和驶离货运码头、泊位、船坞及码头。

How many tugs assist pilotage ?

几艘拖船协助引航？