VTS Traffic Management and Navigation 4 — Questions and Answers
Question 1: A VTS operator receives simultaneous requests from two vessels to enter a narrow channel that can only safely handle one-way traffic. Which factor should take priority in the decision?
- The vessel with the higher gross tonnage goes first
- The vessel that called first gets priority
- The vessel that is more restricted in its ability to maneuver takes priority (Correct answer)
- The vessel with the more hazardous cargo goes first
Correct answer: The vessel that is more restricted in its ability to maneuver takes priority
COLREGS and good seamanship practice prioritize vessels that are constrained by their draft or restricted in maneuverability, as they have fewer options to wait safely.
Question 2: What does the term 'vessel traffic image' refer to in VTS operations?
- A photograph taken by port surveillance cameras
- The operator's composite picture of all vessel traffic built from radar, AIS, and communication data (Correct answer)
- The official radar screenshot stored for legal records
- The graphical display of predicted traffic for the next 24 hours
Correct answer: The operator's composite picture of all vessel traffic built from radar, AIS, and communication data
The vessel traffic image is the operator's comprehensive situational awareness picture assembled from all available data sources including radar, AIS, and VHF reports.
Question 3: A vessel in a VTS area fails to report passing a mandatory waypoint. The VTS operator has been unable to establish radio contact. At what point should the operator escalate to a formal 'overdue' notification?
- Immediately after the missed waypoint report
- After a reasonable time accounting for the vessel's last known speed and position (Correct answer)
- Only after 24 hours have elapsed
- Only if another vessel reports seeing the missing vessel in distress
Correct answer: After a reasonable time accounting for the vessel's last known speed and position
The operator should use the vessel's last known speed and position to estimate expected arrival at the next point, then escalate if the vessel is overdue beyond a reasonable margin.
Question 4: Which AIS message type broadcasts static vessel information such as name, call sign, and type of ship?
- Message Type 1 (Position Report Class A)
- Message Type 5 (Static and Voyage Related Data) (Correct answer)
- Message Type 18 (Standard Class B Position Report)
- Message Type 21 (Aid-to-Navigation Report)
Correct answer: Message Type 5 (Static and Voyage Related Data)
AIS Message Type 5 carries static information including vessel name, call sign, IMO number, ship type, and voyage data.
Question 5: A VTS operator is working the 0000-0600 watch. At 0300, vessel traffic is light and the operator feels drowsy. What is the most appropriate action?
- Reduce radar scan rate to save energy and rest briefly
- Inform the supervisor or on-call relief and take a structured fatigue break per protocol (Correct answer)
- Consume caffeine and continue without notifying anyone
- Log the fatigue and resume normal duties
Correct answer: Inform the supervisor or on-call relief and take a structured fatigue break per protocol
Fatigue management protocols require operators to notify supervisors and use structured relief systems rather than self-managing impairment during a watch.
Question 6: What is the correct VHF channel for vessel-to-vessel and vessel-to-shore distress, safety, and calling in US waters?
- Channel 13
- Channel 16 (Correct answer)
- Channel 22A
- Channel 67
Correct answer: Channel 16
Channel 16 is the international distress, safety, and calling channel that all vessels must monitor while underway.
Question 7: A container ship reports that its bow thruster has become inoperative just before entering a tight turning basin. The VTS operator's best immediate response is to:
- Order the vessel to proceed at reduced speed and manage independently
- Advise the vessel of current conditions, coordinate tug availability, and clear the basin of other traffic (Correct answer)
- Declare a port emergency and halt all operations
- Instruct the vessel to anchor outside the port until repaired
Correct answer: Advise the vessel of current conditions, coordinate tug availability, and clear the basin of other traffic
The VTS operator should provide situational support by advising on conditions, coordinating tugs, and clearing the area to reduce risk for the maneuvering-impaired vessel.
VTS Traffic Management and Navigation 4
A VTS operator receives simultaneous requests from two vessels to enter a narrow channel that can only safely handle one-way traffic.
Which factor should take priority in the decision?