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.
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.
VHF DSC RADIO FEATURES
A VHF DSC radio allows users:
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.
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.