Practice Test Geeks(VTS) Vessel Traffic Services Operator Exam Practice Test
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Navigation Systems Flashcards

7 cards from real VTS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is a Traffic Separation Scheme (TSS) and what is its primary function?

    Answer: A routing measure that separates opposing vessel traffic streams to reduce collision risk

    A TSS is an IMO-adopted routing measure that organizes one-way traffic lanes to separate vessels traveling in opposite directions and reduce collision risk.

  2. In a VTS area, a vessel is observed making a U-turn inside a TSS separation zone. What should the VTS operator do first?

    Answer: Contact the vessel and advise that maneuvering in the separation zone is prohibited under COLREGS Rule 10

    COLREGS Rule 10 prohibits vessels from entering the separation zone except in emergencies, so the VTS operator should first contact and advise the vessel.

  3. What technology does Differential GPS (DGPS) use to improve position accuracy?

    Answer: A reference station with a known position that broadcasts corrections to GPS errors

    DGPS uses a land-based reference station at a precisely known location to calculate GPS errors and broadcast correction signals to nearby receivers.

  4. Which COLREGS rule specifically addresses vessels' responsibilities in Traffic Separation Schemes?

    Answer: Rule 10

    COLREGS Rule 10 covers conduct of vessels in Traffic Separation Schemes, including requirements for joining, leaving, and crossing separation lanes.

  5. A vessel reports its position by latitude and longitude, but the position plots in the middle of land on the VTS chart. What is the most likely explanation?

    Answer: The vessel transposed or misread its GPS coordinates

    A position that plots on land most commonly results from the vessel transposing digits or misreading its GPS display when making the report.

  6. What is the purpose of an Electronic Chart Display and Information System (ECDIS) in a VTS center?

    Answer: To display digital nautical charts integrated with sensor data such as AIS, radar, and GPS

    ECDIS integrates official electronic charts with real-time AIS, radar, and positioning data, giving VTS operators a comprehensive situational awareness picture.

  7. What is the key difference between a vessel's 'course over ground' (COG) and its 'heading'?

    Answer: Heading is the direction the bow points; COG is the actual direction of travel accounting for current and wind

    Heading is the direction the vessel's bow points, while COG reflects the actual path made good through the water, which differs due to current and leeway.