RYA SRC VHF Radio Procedures 3

Question 1

What is VHF Channel 70 exclusively reserved for?

Accepted Answer

Digital Selective Calling (DSC)

Answer

Channel 70 is exclusively reserved for Digital Selective Calling (DSC) and must not be used for voice communications.

Question 2

After transmitting a DSC distress alert on Channel 70, on which channel should the subsequent voice MAYDAY call be made?

Accepted Answer

Channel 16

Answer

Following a DSC alert on Ch 70, the voice MAYDAY and all distress communications take place on Channel 16.

Question 3

What is the maximum transmit power of a handheld VHF radio?

Accepted Answer

5 watts

Answer

Handheld VHF radios have a maximum output of 5 watts, compared to 25 watts for fixed-mount units.

Question 4

When changing from Channel 16 to a working channel, what is the correct procedure?

Accepted Answer

Acknowledge on Ch 16, confirm the working channel, then both vessels switch

Answer

Both parties should confirm the agreed working channel on Ch 16 before switching, ensuring no miscommunication.

Question 5

Which international body is responsible for allocating VHF marine radio channels?

Accepted Answer

ITU (International Telecommunication Union)

Answer

The ITU allocates and regulates the use of the radio frequency spectrum, including marine VHF channels, internationally.

RYA SRC Practice Test