Practice Test Geeks(VTS) Vessel Traffic Services Operator Exam Practice Test
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Equipment and Technology 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.

Read the first 7 Equipment and Technology flashcards as text

  1. What is the function of the DSC (Digital Selective Calling) controller integrated into a VTS VHF radio system?

    Answer: It enables direct digital calls to individual vessels by MMSI number and handles distress alerts

    DSC allows VTS operators to place priority calls directly to specific vessels using their MMSI, and automatically receives distress alerts transmitted on Channel 70.

  2. In VTS radar, what does 'pulse length' affect in terms of radar performance?

    Answer: The range resolution — shorter pulse lengths provide better range discrimination between close targets

    Shorter pulse lengths improve range resolution (ability to distinguish two targets at similar ranges), while longer pulses increase detection range but reduce resolution.

  3. What does the IMO performance standard require for the minimum range of an X-band VTS radar for detecting a small vessel with 10 m² radar cross-section?

    Answer: 8 nautical miles

    IMO/ITU performance standards for VTS radars typically require detection of a 10 m² target at a minimum of 8 nautical miles in normal propagation conditions.

  4. A VTS operator's workstation displays 'Heading Line' data on AIS targets. What is the source of this information?

    Answer: The vessel's gyrocompass or electronic heading sensor connected to the AIS transponder

    AIS transmits true heading from the vessel's gyrocompass or heading sensor; this is distinct from course over ground which is GPS-derived.

  5. What is the primary function of a VTS meteorological sensor network (anemometers, visibility sensors)?

    Answer: To provide real-time environmental data that VTS operators relay to mariners for safe transit decisions

    Met sensors give VTS operators current visibility, wind speed/direction, and sea state data that they use to advise vessels and inform traffic management decisions.

  6. In the context of VTS data recording, what is an 'SDVR' (Shore-based Data and Voice Recorder) required to retain according to IALA guidelines?

    Answer: All sensor data, AIS tracks, radar replays, and voice recordings for a minimum of 30 days

    IALA guidelines recommend that VTS shore-based recorders retain all sensor data, radar, AIS, and audio for at least 30 days to support post-incident investigation.

  7. What is the purpose of 'track history' or 'track trail' displayed on a VTS radar or VTMIS screen?

    Answer: To show the past positions of a tracked target, allowing operators to assess its recent movement pattern

    Track history displays a series of past target positions as a trail, allowing operators to observe speed changes, course alterations, and unusual behavior patterns.