CMRT CMRT Navigation Integration & Display Systems

Question 1

What is the primary purpose of ARPA (Automatic Radar Plotting Aid) in marine radar systems?

Accepted Answer

To automatically track targets and predict collision risk

Answer

To enhance display brightness

Answer

To calibrate antenna rotation speed

Answer

To filter sea clutter

Question 2

In a radar overlay on an Electronic Chart Display (ECDIS), what must be synchronized between the two systems?

Accepted Answer

Position reference and heading data

Answer

Audio alert tones

Answer

Printer output format

Answer

Screen refresh rate only

Question 3

Which display mode shows radar targets relative to the vessel's bow and rotates as the ship turns?

Accepted Answer

Head-Up

Answer

North-Up

Answer

Course-Up

Answer

True Motion

Question 4

What does 'sea clutter' on a radar display represent?

Accepted Answer

Returns caused by rough sea surface waves near the antenna

Answer

False echoes from nearby vessels

Answer

Interference from other radar systems

Answer

Electronic noise within the receiver

Question 5

Which NMEA sentence is most commonly used to feed GPS position data into a marine radar system?

Accepted Answer

NMEA $GPGLL or $GPRMC

Answer

NMEA $GPVTG

Answer

NMEA $GPGSV

Answer

NMEA $GPGSA

Question 6

In True Motion display mode, what remains stationary on the radar screen?

Accepted Answer

Stationary land and fixed targets

Answer

The own-ship symbol

Answer

All tracked ARPA targets

Answer

The heading line