CMRT Navigation & Chart Integration

Question 1

What does ARPA stand for in marine radar systems?

Accepted Answer

Automatic Radar Plotting Aid

Answer

Advanced Radar Processing Array

Answer

Automated Range and Position Adjuster

Answer

Analog Radar Pulse Amplifier

Question 2

What is the primary purpose of radar overlay on an ECDIS display?

Accepted Answer

To superimpose live radar returns onto the electronic chart for correlated situational awareness

Answer

To add color to the chart

Answer

To replace the paper chart backup

Answer

To increase the radar transmission power

Question 3

In radar navigation, what does 'true motion' display mode show?

Accepted Answer

Own ship and targets moving according to their actual courses and speeds over ground

Answer

All targets moving relative to own ship

Answer

Only stationary land targets

Answer

Only vessels under 300 gross tons

Question 4

What is the purpose of a parallel index (PI) line in radar navigation?

Accepted Answer

To maintain a safe passing distance from a navigational hazard by tracking a fixed bearing line

Answer

To measure the radar beam width

Answer

To calibrate the radar's north alignment

Answer

To set the pulse repetition frequency

Question 5

What is MARPA, as distinguished from full ARPA, in marine radar?

Accepted Answer

Mini Automatic Radar Plotting Aid, a simplified target-tracking feature found on smaller vessel radars

Answer

A manual plotting system requiring paper charts

Answer

A military-grade radar system

Answer

A radar frequency band used in coastal waters

Question 6

Which NMEA sentence is most commonly used to transfer radar target data to an ECDIS or chartplotter?

Accepted Answer

NMEA 0183 TTM (Tracked Target Message)

Answer

NMEA 2000 PGN 127250

Answer

NMEA 0183 GLL

Answer

IEC 61162-1 VHW