Pilotage is compulsory for all large non-local vessels visiting Hong Kong so as to ensure their safe navigation within Hong Kong waters.
Since Captains of sea-going vessels may not be familiar with the geographical setting of the Port of Hong Kong as well as its marine traffic situation, pilots have to accompany the Captains when the sea-going vessels enter or leave Hong Kong. Navigational advice is given until the vessels are secured safely at piers or anchorages, or have left the busy areas of the Port.