CMRT CMRT Navigation Integration & Display Systems 2

Question 1

What is the function of the Electronic Bearing Line (EBL) on a radar display?

Accepted Answer

Measures the bearing to a target from own ship

Answer

The EBL is a rotatable line from the vessel's position used to measure the bearing of a target or landmark on the radar display.

Question 2

Which radar display feature is used to measure the distance to a target?

Accepted Answer

Variable Range Marker (VRM)

Answer

The Variable Range Marker (VRM) is a range ring that the operator adjusts to coincide with a target to read off the distance.

Question 3

What is a radar 'guard zone' used for?

Accepted Answer

Alerting the watch when a target enters a defined area around the vessel

Answer

A guard zone is a user-defined sector or ring that triggers an alarm when a radar return enters it, warning of potential collision hazards.

Question 4

What does TCPA stand for in ARPA radar systems?

Accepted Answer

Time to Closest Point of Approach

Answer

TCPA (Time to Closest Point of Approach) indicates how many minutes until a tracked target reaches its minimum distance from own ship.

Question 5

In a radar display, what is the purpose of the 'rain clutter' (FTC) control?

Accepted Answer

Reduces large returns from precipitation to reveal targets within the rain

Answer

The Fast Time Constant (FTC) or rain clutter control differentiates rapid signal changes to suppress extended rain returns and reveal point targets within precipitation.

(CMRT) Certified Marine Radar Technician Practice Test

(CMRT) Certified Marine Radar Technician Practice Test

CMRT CMRT Navigation Integration & Display Systems 2