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A period of duty is the total time that a VTSO will be required to be present at the VTS Centre irrespective of whether or not the VTSO is carrying out actual watchkeeping duties at a VTS workstation.

Source: IALA Guideline 1045 (2005)

(VTS33/output/8 refers)

Vessel Traffic Services

Vessel Traffic Service Officer

VTS Operator

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM