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

The purpose of radar is to enable ….

A the range and bearing of objects to be obtained.

B the wave-lengths of radio waves to be calculated.

C the echoes of targets to be separated.

D the speed of radio waves to be measured.

Question 2

Radar bearing discrimination depends mainly on which of the following?

A Horizontal beamwidth.

B Pulse length.

C Scanner rotation speed.

D Transmitted frequency.

Question 3

Radar reflectors are fitted to some buoys and small craft in order to ...

A provide positive identification.

B make them better radar targets.

C avoid mutual radar preference.

D obtain more accurate ranges.

Question 4

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 5

Super-refraction is normally caused by ...

A warm air over cool sea surface.

B cool air over a warm sea surface.

C strong winds.

D disturbances in the upper atmosphere.

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