VHF Communication Quiz

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Questions and Answers

Which channel is used only for digital selective calling (DSC) on VHF frequencies?

Channel 16

Channel 6

Channel 22A

Channel 70 (correct)

Which channel is utilized for the required bridge-to-bridge watch using non-DSC VHF-FM?

Channel 13

Channel 16 (correct)

Vessel's working frequency

Channel 70

Which channel would most likely be used for routine ship-to-ship voice traffic on VHF frequencies?

Channel 22A

Channel 70

Channel 08 (correct)

Channel 16

What channel would you use to place a call to a shore telephone on VHF frequencies?

Channel 28 Signup and view all the answers

Which mode allows receipt of vessel traffic lists from high seas shore stations on MF-HF frequencies?

SSB and FEC Signup and view all the answers

Why must all MF-HF Distress, Urgency, and Safety communications take place only on the 6 assigned frequencies and simplex operating mode?

For both GMDSS and non-GMDSS ships, to maximize the chances for other vessels to receive those communications following the correct priority. Signup and view all the answers

In which sea areas is it always compulsory to maintain a watch on VHF Channel 16?

Sea areas A2, A3 and A4 Signup and view all the answers

What is the duration of a silent period to be observed at how many minutes past the hour when a watch is required on 2182 kHz?

3 minutes at 00 and 30 minutes past the hour Signup and view all the answers

Which statement is true regarding maintaining a watch on VHF Channel 16?

Maintaining a watch on VHF Channel 16 is compulsory at all times while at sea, unless the vessel is in a VTS system. Signup and view all the answers

What are the mandatory DSC watchkeeping bands/channels?

VHF Ch-70, 2 MHz MF DSC, 8 MHz HF DSC, and 1 other HF DSC Signup and view all the answers

When is a watch on VHF Channel 16 not required?

When a vessel is in a VTS system and monitors both Ch-13 and VTS channel Signup and view all the answers

Who is responsible for maintaining a watch on VHF Channel 16?

The operator responsible for the station operation or maintenance Signup and view all the answers

What is the purpose of the 'Scan' function?

Sequentially scan all or selected channels Signup and view all the answers

Which channel must VHF-FM-equipped vessels monitor at all times when the vessel is at sea?

Channel 16 Signup and view all the answers

Why must all VHF Distress, Urgency and Safety communications be performed in Simplex operating mode?

To ensure that vessels not directly participating in the communications can hear both sides of the radio exchange Signup and view all the answers

What frequency and emission is used for aircraft distress communications?

121.500 MHz - F3E Signup and view all the answers

What is the purpose of adjusting squelch control to approximately twice the minimum level necessary to barely suppress any background noise?

To receive clear signals Signup and view all the answers

When must VHF-FM-equipped vessels monitor Channel 16?

When at sea Signup and view all the answers

Study Notes

VHF Radio Operations

Adjust squelch control to approximately twice the minimum level necessary to barely suppress any background noise.
The "Scan" function is used to monitor Ch-16 continuously, switch to either Ch-70 or Ch-13 every 5 seconds, scan Ch-16 for Distress calls, and scan Ch-70 for Distress alerts.
All VHF Distress, Urgency, and Safety communications (as well as VTS traffic calls) must be performed in Simplex operating mode to ensure that vessels not directly participating in the communications can hear both sides of the radio exchange.

VHF Channel Selection

VHF-FM-equipped vessels must monitor Ch-16 at all times when the vessel is at sea.
The aircraft frequency and emission used for distress communications is 121.500 MHz - A3E.
Ch-70 is used only for digital selective calling.
VHF-FM on Ch-13 in most areas of the continental United States is used for the required bridge-to-bridge watch.
Ch-08 is used for routine ship-to-ship voice traffic.
Ch-28 is used to place a call to a shore telephone.

MF-HF Equipment Controls

Modes that can be selected to receive vessel traffic lists from high seas shore stations are VHF-FM and SSB.
All MF-HF Distress, Urgency, and Safety communications must take place solely on the 6 assigned frequencies and in the simplex operating mode to maximize the chances for other vessels to receive those communications.

Watchkeeping

A 3-minute silent period must be observed at 00 and 30 minutes past the hour when a watch is required on 2182 kHz.
A watch on VHF Ch-16 is compulsory at all times while at sea until further notice, unless the vessel is in a VTS system.
The mandatory DSC watchkeeping bands/channels are 2 MHz MF DSC, 6 MHz DSC, VHF Ch-70, and 1 other HF DSC.

Logkeeping

The licensed operator or a person whom they designate is required to make entries in a required service or maintenance log.
The station licensee is responsible for the proper maintenance of station logs.

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Description

Test your knowledge on VHF communication procedures and terminology. Questions cover topics such as adjusting squelch controls, using scan functions, and operating in Simplex mode for distress calls.