ETO Navigation Electronics & GMDSS 2

Question 1

What does AIS stand for in the context of marine navigation equipment?

Accepted Answer

Automatic Identification System

Answer

AIS stands for Automatic Identification System; it automatically broadcasts vessel identity, position, speed, and course data to nearby ships and shore stations via VHF.

Question 2

On which VHF channels does Class A AIS operate for its transmissions?

Accepted Answer

Channels 87B (161.975 MHz) and 88B (162.025 MHz)

Answer

Class A AIS transmits alternately on VHF channels 87B (161.975 MHz) and 88B (162.025 MHz), which are internationally designated solely for AIS use.

Question 3

Which radar frequency band provides the best target resolution for close-range navigation in congested waters?

Accepted Answer

X-band (9-10 GHz)

Answer

X-band radar (9-10 GHz) uses shorter wavelengths that produce superior target discrimination and range resolution, making it the preferred band for coastal and harbor navigation.

Question 4

What is the primary function of ECDIS aboard a vessel?

Accepted Answer

Electronic Chart Display and Information System used as an approved navigation system

Answer

ECDIS (Electronic Chart Display and Information System) displays official Electronic Navigational Charts and integrates position, radar overlay, and route planning data as an approved replacement for paper charts.

Question 5

What does the ARPA CPA/TCPA alarm warn the officer of the watch about?

Accepted Answer

A tracked target whose closest point of approach or time to CPA falls below preset alarm thresholds

Answer

The CPA/TCPA alarm activates when ARPA calculates that a tracked target will pass within the preset minimum CPA distance or within the set TCPA time, alerting the officer to a potential collision risk.

ETO - Electro-Technical Officer Practice Test

ETO - Electro-Technical Officer Practice Test

ETO Navigation Electronics & GMDSS 2