CMRT CMRT Navigation Integration & Display Systems 3

Question 1

Which radar range scale is most appropriate for harbor entry and collision avoidance at close quarters?

Accepted Answer

0.5 to 1.5 nautical miles

Answer

Short range scales of 0.5–1.5 NM provide the detail needed for precise maneuvering, collision avoidance, and navigation in confined waters.

Question 2

What is the role of the heading sensor interface in a marine radar system?

Accepted Answer

Provides vessel heading to stabilize the radar picture and enable true bearing readout

Answer

The heading sensor (gyrocompass or fluxgate) feeds heading data to the radar so the display can be stabilized and bearings referenced to true north.

Question 3

What is 'target swap' in ARPA, and why is it dangerous?

Accepted Answer

When ARPA incorrectly transfers tracking data between two nearby targets, producing false motion vectors

Answer

Target swap occurs when ARPA loses track of one target and associates its history with an adjacent target, producing dangerously incorrect CPA/TCPA predictions.

Question 4

Which IMO standard defines performance requirements for shipborne radar equipment?

Accepted Answer

IMO Resolution MSC.192(79)

Answer

IMO Resolution MSC.192(79) sets the revised minimum performance standards for shipborne radar, covering detection, display, ARPA, and environmental requirements.

Question 5

In radar display terminology, what is 'persistence' or 'afterglow'?

Accepted Answer

The continued glow of a radar return on the display after the antenna sweep has passed, showing target history

Answer

Persistence (afterglow) is the feature that retains previous radar sweeps on the display so operators can see target history and detect movement over time.

(CMRT) Certified Marine Radar Technician Practice Test

(CMRT) Certified Marine Radar Technician Practice Test

CMRT CMRT Navigation Integration & Display Systems 3