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100+ Free GMDSS ROC Radio Practice Questions

GMDSS Restricted Operator Certificate (ROC) practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: GMDSS ROC Radio Exam

70% pass

Official MCA/AMERC ROC exam pass mark is 70%

AMERC GMDSS ROC syllabus

Sea Area A1

Valid for vessels operating in coastal VHF range

SOLAS Chapter IV GMDSS rules

3-4 days

Training course duration including practical simulator test

AMERC ROC specifications

120 mins

Total assessment duration

MCA ROC exam guidelines

100

Free practice MCQs in this study bank

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GMDSS Restricted Operator Certificate (ROC) is an MCA/AMERC written and practical simulator assessment with a 70% pass mark. Course & exam fee £600–£750. Syllabus covers VHF channels 30%, DSC & MMSI 25%, distress procedures 20%, Sea Area A1 devices 15%, regulations & batteries 10%. Local 100 MCQs are an English study adaptation.

Sample GMDSS ROC Radio Practice Questions

Try these sample questions to test your GMDSS ROC Radio exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary purpose of VHF Channel 16?
A.Routine ship-to-ship calls
B.Distress, urgency, safety, and calling
C.Port operations
D.Public correspondence
Explanation: Channel 16 is the international distress, urgency, safety, and calling channel. All vessels must monitor it when at sea.
2Which VHF channel is used for digital selective calling (DSC)?
A.Channel 13
B.Channel 16
C.Channel 70
D.Channel 06
Explanation: Channel 70 is exclusively reserved for DSC. Voice communications are prohibited on this channel.
3What is the typical maximum range of VHF marine radio communication?
A.5 to 10 nautical miles
B.20 to 30 nautical miles
C.50 to 100 nautical miles
D.Over 100 nautical miles
Explanation: VHF radio operates on a line-of-sight basis, typically offering a range of 20 to 30 nautical miles depending on antenna height.
4Which power setting should normally be used for close-range communications?
A.1 Watt (Low)
B.5 Watts (Medium)
C.25 Watts (High)
D.Maximum available
Explanation: To avoid interfering with other stations, 1 Watt should be used for close-range communication such as within a marina.
5Which VHF channel is designated for intership safety communications?
A.Channel 06
B.Channel 12
C.Channel 16
D.Channel 70
Explanation: Channel 06 is designated as the primary intership safety channel for search and rescue.
6What does the 'Dual Watch' feature on a VHF radio do?
A.Monitors Channel 16 and another selected channel
B.Monitors Channels 16 and 70 simultaneously
C.Allows transmission on two channels at once
D.Records incoming messages
Explanation: Dual Watch continuously monitors Channel 16 and one other working channel selected by the user.
7Why must a vessel keep a listening watch on VHF Channel 16?
A.To hear weather forecasts
B.To intercept distress calls and safety warnings
C.To chat with other vessels
D.To monitor harbor traffic
Explanation: International regulations require monitoring Channel 16 while at sea to assist in distress situations.
8What is a 'simplex' channel?
A.A channel using different frequencies to transmit and receive
B.A channel using the same frequency to transmit and receive
C.A channel only used for data
D.A channel exclusively for distress
Explanation: Simplex operation uses one single frequency for both transmitting and receiving, meaning only one station can transmit at a time.
9Which of the following channels is a duplex channel?
A.Channel 16
B.Channel 06
C.Channel 13
D.Channel 80
Explanation: Channel 80 is a duplex channel used for public correspondence (ship-to-shore via coast station).
10What is the standard output power of a fixed VHF marine radio on 'High' setting?
A.1 Watt
B.5 Watts
C.25 Watts
D.50 Watts
Explanation: Marine VHF fixed radios have a maximum legal transmission power of 25 Watts.

About the GMDSS ROC Radio Practice Questions

Verified exam format metadata for GMDSS Restricted Operator Certificate (ROC) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.