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

Radar bearing discrimination depends mainly on which of the following?

A Horizontal beamwidth.

B Pulse length.

C Scanner rotation speed.

D Transmitted frequency.

Question 2

An alternative name for the anti-rain clutter control is the ...

A Fast Time Constant Control.

B Sensitivity Time Control.

C Swept Gain Control.

D Shift Control.

Question 3

An operation check required on installation is to ….

A measure the frequency of the local oscillator.

B measure the peak power output.

C determine the length of waveguide.

D determine the limits of shadow sectors.

Question 4

The gain control should be adjusted so that ….

A there is a light speckled background on the screen.

B no clutter echoes are showing on the screen.

C clutter echoes are showing at maximum strength.

D the screen background has no speckling.

Question 5

Positions obtained by radar …

A should only be used in restricted visibility.

B cannot be relied on for navigation.

C should be used independently of other aids.

D should be checked by other available means.

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