Everything you need to know about VHF DSC radios, including their functions, features, and proper usage, plus our recommended radios.
VHF DSC radios are essential communication devices for sea-going vessels, and provide a reliable way to call for help in emergency situations. This basic guide covers everything you need to know about them.
What is a VHF DSC radio?
Some VHF marine radios include Digital Selective Calling (DSC), an important maritime distress and safety system, which is designed to improve safety at sea. DSC communication systems enable a VHF radio to:
- Send an emergency distress signal to all DSC-equipped vessels (or Coast Guard) within radio range, in the form of a digital alert
- Initiate a call to a specific radio channel
- Initiate a call to all channels on a particular frequency
- Monitor the radio for emergency transmissions from other vessels
VHF DSC radios automatically monitor channel 70 (which is reserved exclusively for DSC communication), looking for emergency transmissions from other marine radios. If it picks up this type of alert, the radio emits a high-pitched audio alarm, and makes a note of the position of the vessel in distress, as well as a time log.
What else can a VHF DSC radio do?
As well as sending a DSC distress alert at the touch of a button, the radio can perform other functions, for example:
- Automatically send your vessel’s identification number and precise location to others, within seconds.
- Communicate with shore-based VHF users, e.g. Coast Guard, harbour masters, lock-keepers and marinas
- Dial other vessels to have one-to-one conversations directly using a unique identity number.
What are the benefits of using DSC calling?
Apart from the obvious benefit of transmitting distress alerts, DSC ensures you don’t miss safety broadcasts. Non-scheduled maritime safety information or security broadcasts from coastguard stations or ships automatically trigger an alert on DSC equipment so you are aware of it.
DSC can also be used for routine calls to other vessels (singly or as a group). Simply enter their dedicated number (Maritime Mobile Service Identity, or MMSI number), and choose a VHF working channel to send the call. Group DSC calls work well with yacht clubs, races, regattas, etc.
DSC can be built into both handheld and fixed radios
DSC technology is found in both handheld and fixed radios, although power and range tends to be stronger in fixed radios, whose antenna is generally fitted to a tall mast. Ideally, vessels ought to have both on board, as handheld radios provide mobility and flexibility in a range of emergency situations, and are generally waterproof, too.
Do small leisure craft need DSC capability in their radio?
A private leisure craft, sailing close to the shore, might not need the full range of GMDSS radio equipment. However, a DSC-enabled VHF radio is the minimum recommendation their crew should aim to have on board.
Who can use a VHS DSC radio?
An operator’s licence, called the Short-Range Certificate, is required for anyone wishing to use a VHF DSC radio on pleasure or commercial vessels. This licence enables the operator to use any handheld marine VHF/DSC radio which is not permanently fitted to a vessel.
In an emergency, any crew member can use a VHS DSC radio. However, if you sail regularly, it’s advisable to do the one-day course so you know what to do if the need arises.
The following link takes you to a range of helpful information regarding maritime safety, published by the European Maritime Safety agency.
Recommended VHF DSC radios
When it comes to choosing the right VHF DSC radio for your vessel, it’s essential to select one that suits your specific needs. Two exceptional options to consider are the Icom IC-M94D and the Icom IC-M330GE, chosen for their cutting-edge safety features, reliable performance, and suitability for a wide range of maritime activities. Both radios come with robust safety features and modern technology, making them excellent choices for various maritime activities.
Icom IC-M94D: A Powerful Handheld Option
The Icom IC-M94D is a reliable handheld VHF transceiver that combines Digital Selective Calling (DSC) and AIS (Automatic Identification System) into a single package, offering enhanced safety and usability. Its 6 watts of output power ensures extended communication range, while the 2400 mAh Li-Ion battery provides up to 10 hours of operation. Features like Float 'n' Flash, IPX7 submergibility, and integrated GPS make it a great portable option for any mariner.
Icom IC-M330GE: A Compact Fixed Radio Solution
The Icom IC-M330GE is an ultra-compact fixed VHF radio, ideal for vessels with limited space. It offers a built-in GPS receiver with an external GPS antenna for accurate navigation and reliable DSC calls. Features such as AquaQuake to prevent waterlogged speakers, dynamic audio clarity, and intuitive controls make it a dependable choice for fixed installations.
Choosing the Right Radio for Your Needs
Both the IC-M94D and IC-M330GE are outstanding options, but your choice depends on your specific needs and vessel type. Whether you prioritize portability and AIS integration with the IC-M94D or prefer a fixed, space-efficient design with the IC-M330GE, either option ensures reliable communication and enhanced safety at sea.