VHF Radio Procedures Flashcards

What is the maximum permitted power output for a handheld VHF marine radio?

Answer: 6 watts

Handheld VHF radios are typically limited to a maximum of 5-6 watts. Fixed VHF sets can transmit at up to 25 watts. Operators should always use the minimum power necessary.

What is a 'working channel' in VHF radio communications?

Answer: A channel agreed upon by two stations to conduct their communications after initial contact on the calling channel

After making initial contact on Channel 16 (or another calling channel), stations agree to switch to a working channel — a designated frequency for their ongoing communication, keeping Channel 16 clear.

What information must be included in a vessel's Ship Radio Licence?

Answer: The vessel name, call sign, MMSI number, and details of the radio equipment on board

A Ship Radio Licence (issued by Ofcom in the UK) includes the vessel name, call sign, MMSI (Maritime Mobile Service Identity) number, and details of all radio equipment fitted.

What is the purpose of a 'radio check' and on which channel should it be conducted?

Answer: To verify that the radio is working correctly, typically conducted on a designated working channel or with a coast station — not on Channel 16

A radio check verifies that the set is working and transmissions are being received clearly. It should be conducted on a working channel or with a coast station, NOT on Channel 16 (except in areas where this is permitted).

What is the readability scale used when responding to a radio check?

Answer: A scale from 1 to 5, where 1 is unreadable and 5 is perfectly readable

The readability scale runs from 1 (unreadable) to 5 (perfectly readable). A typical response might be 'Your signal is strength 5, loud and clear.'

What is the correct procedure if you hear a Mayday call from another vessel?

Answer: Listen carefully, write down the details, and if no coast station acknowledges, relay the Mayday call

All stations hearing a Mayday must listen carefully and record the details. If no coast station (coastguard) acknowledges within a reasonable time, the nearest vessel should relay the call.