Marine VHF Radio for Leisure Sailors

There are many ways to communicate with others at sea ranging from signal flags to satellite phones. While it is not a legal requirement in most countries, leisure sailors are strongly encouraged to use a VHF DSC (Digital Selective Calling) Radio as their primary means of communication, since this is used by the rescue authorities and commercial shipping. VHF operates up to about 30 nautical miles from land, but for offshore cruising, SSB radio is the preferred option as it has a much better range than VHF.

Is VHF DSC Radio really necessary for inshore sailing?

It is a mistake to believe that a mobile phone is all that is required for inshore sailing. Mobile phones are a useful back-up but cannot be relied on, as even when close to the shore signal can easily be lost.


A VHF DSC radio allows users:

  • to communicate with shore-based VHF users such as the Coastguard, harbour masters, lock-keepers and marinas
  • to dial up other vessels by using a unique identity number
  • to have one-to-one conversations with other vessels
  • to send distress alerts at the touch of a button
  • to automatically send your vessel’s identification number and position to others.

Operator’s Licence

Anyone who uses a VHF DSC Radio must have an operator’s licence, the Short Range Certificate. In an emergency, any crew member can use the radio, but it is advisable for those who sail regularly to do the one-day course and get their own certificate, so that if for any reason the skipper is unable to use the radio, there are others aboard who know the correct radio procedure and can act quickly if the need arises.

Fixed Radios vs Handheld

VHF DSC Radios are available as fixed radios attached to a vessel or as handheld, personal radios. It is a good idea to have both types aboard. Fixed radios are generally more powerful and have a better range than handheld radios. The fixed radio’s range is greatly improved when its antenna is fixed to the top of a tall mast. Handheld radios are smaller and portable, most are waterproof and can be very useful in an emergency.

Emergency Calls

When a VHF DSC Radio is turned on, it automatically monitors Channel 70 for emergency calls. If another vessel transmits a digital alert then this is picked up by the receiver and causes a high pitched audio alarm to sound. The position of the vessel in distress and the time of the signal are given in text format. Voice communications can continue on Channel 16 as with a standard VHF Radio. In an emergency, anyone may use a VHF DSC Radio to call for help on Channel 16.

In an emergency anyone may use a VHF DSC Radio to call for help on Channel 16. A VHF DSC Radio may be operated by a non-qualified user under the supervision of a qualified operator.

Further information can be found at NIDIRECT Government Services website on how to call for help in an emergency at sea via this link

Safety regulations for pleasure craft

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