Practice Test Geeks(CMRT) Certified Marine Radar Technician Practice Test
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CMRT Target Tracking & ARPA Flashcards

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

Read the first 6 CMRT Target Tracking & ARPA flashcards as text

  1. Which of the following best describes 'relative vector' in ARPA display?

    Answer: A vector showing target motion relative to own ship's motion

    A relative vector shows where the target will be relative to own ship if both maintain course and speed, making it useful for direct collision assessment.

  2. When performing a 'trial maneuver' on an ARPA, what information does the technician/operator obtain?

    Answer: The predicted effect of a course or speed change on target CPAs before actually maneuvering

    The trial maneuver function simulates the effect of an intended course or speed change on all tracked targets' CPA and TCPA values.

  3. A CMRT notices that ARPA tracking accuracy degrades significantly in high sea states. What is the most likely cause?

    Answer: Sea clutter suppression removes genuine target returns, causing tracking dropouts

    Sea clutter rejection circuits can inadvertently suppress small vessel echoes in heavy seas, causing ARPA to lose track and degrade accuracy.

  4. What ARPA alarm is triggered when a tracked target's CPA and TCPA fall within user-set threshold values?

    Answer: Collision alarm (CPA/TCPA alarm)

    The CPA/TCPA alarm activates when a tracked target is predicted to pass closer than the operator-set CPA limit within the set TCPA time window.

  5. Which IEC standard specifically covers performance requirements for shipborne radar systems, including ARPA?

    Answer: IEC 62388

    IEC 62388 specifies the minimum performance requirements for shipborne radar, including ARPA tracking functionality.

  6. After replacing a radar transceiver on a vessel with ARPA, which verification step is mandatory before returning the system to service?

    Answer: Verify ARPA heading and speed sensor inputs are correctly interfaced and target tracking accuracy is within specification

    Following transceiver replacement, sensor interface integrity and ARPA tracking accuracy must be verified to ensure collision-avoidance functionality is restored.