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.

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  1. What does ARPA stand for in the context of marine radar systems?

    Answer: Automatic Radar Plotting Aid

    ARPA stands for Automatic Radar Plotting Aid, a system that automatically tracks targets and computes their motion vectors.

  2. Which parameter does ARPA calculate to determine collision risk with a tracked target?

    Answer: Closest Point of Approach (CPA)

    ARPA calculates CPA (Closest Point of Approach) and TCPA (Time to CPA) to assess collision risk with each tracked target.

  3. What is the minimum number of targets an ARPA system complying with IMO Resolution MSC.192(79) must be capable of tracking simultaneously?

    Answer: 100

    IMO Resolution MSC.192(79) requires ARPA systems to track a minimum of 100 targets simultaneously.

  4. In ARPA terminology, what is 'target swap'?

    Answer: A tracking error where the system exchanges the identity of two nearby targets

    Target swap occurs when two closely spaced targets pass near each other and the ARPA incorrectly exchanges their tracked identities.

  5. What is the purpose of the 'guard zone' feature in an ARPA/radar system?

    Answer: To automatically alarm when a target enters a defined range or sector

    A guard zone triggers an alarm whenever a radar return or tracked target enters the user-defined range ring or sector area.

  6. Which ARPA display mode presents all tracked target vectors relative to the water rather than the ground?

    Answer: True Motion – Sea Stabilized

    Sea-stabilized true motion removes own-ship movement through the water, showing target vectors relative to the water mass.