Bridge Navigation & Deck Operations

Radar & ARPA Competence Test

This test covers the principles and practical use of marine radar and ARPA systems for safe navigation and collision avoidance. It includes questions on radar theory, equipment operation, echo interpretation, CPA/TCPA assessment, radar plotting, and compliance with COLREG. Ideal for navigational officers preparing for operational or management certification.

Questions 15

Time Limit 9 min

Language English

Sample Questions

Here are some example questions from this quiz. Download the GYRO app to take the full test.

Question 1

A radar presentation feature which can often be used to advantage for position fixing is ...

A an unstabilised presentation.

B relative motion.

C beamwidth distortion.

D an off-centred display.

Question 2

The cause of shadow or blind sectors is ...

A rough weather conditions.

B side lobes of the radar beam.

C obstructions on your own ship.

D electromagnetic interference.

Question 3

The principle of a racon is that it ...

A transmits continuously on X band.

B transmits at fixed time intervals.

C transmits when activated by an operator.

D transmits on receipt of ship’s radar pulse.

Question 4

Before taking target bearings, you should check that ….

A the gain control is set to zero.

B the heading marker is switched off.

C the Variable Range Marker is switched on.

D the trace is correctly centred.

Question 5

Low and sandy beaches should be avoided if possible when position fixing by radar because of ...

A low accuracy.

B high visibility.

C strong tidal currents.

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