How the nautical VHF works for communication and safety at sea
Anyone who frequents the sea knows that caution is never too much. Many novice boaters make the mistake of relying exclusively on their smartphones for on-board communications, ignoring that cellular coverage quickly vanishes as they move away from the coast and that, in case of emergency, a phone does not allow all rescuers and boats in the vicinity to be contacted at the same time.
This is where the marine VHF comes into play, the instrument that represents the true umbilical cord between the boat and the mainland. In this article we will explore in detail what marine VHF is for, when it becomes a legal obligation and how to master its operation to navigate with total peace of mind.
What is marine VHF used for?
VHF (Very High Frequency) is an international radio communication system operating on the nautical band. But, concretely, what is the marine VHF used for during navigation?
Its main functions are divided into three vital categories:
Safety and Rescue: It is the primary tool for sending requests for help (Mayday) or danger signals (Pan-Pan). Thanks to the radio range, your message is received not only by the Coast Guard, but also by all ships within the receiving range, exponentially increasing the chances of rapid rescue.
Weather Reports: Through dedicated channels, it is possible to receive constant updates from the "Meteomar" service, essential for anticipating storms or sudden changes in marine conditions.
Operational Communications: It is used to communicate with ports and the navy to request mooring, or to coordinate maneuvers with other nearby vessels, avoiding collisions in busy areas.
When is VHF mandatory on the boat?
Italian legislation regulates in detail the safety equipment to be had on board. In this context, one of the most common questions concerns the obligation of VHF on the boat. According to the Recreational Boating Code, the marine VHF (whether fixed or portable) is mandatory for all boats sailing beyond 6 miles from the coast.
However, even if you navigate within this limit, equipping yourself with a radio device is highly recommended: an unexpected event can happen at any distance and the response speed of a radio signal is unparalleled compared to that of a mobile phone. Also remember that, in order to legally use the radio, it is necessary that there is at least one person on board in possession of the Limited Certificate of Radiotelephony Operator and that the device has the Operating License.
How the nautical VHF works: technology at the service of navigation
To use the tool with awareness, it is helpful to understand how marine VHF works. Unlike civil radios, marine VHF broadcasts on frequencies between 156 and 174 MHz. The signal travels by "line of sight": this means that the range depends a lot on the height of the antenna (the higher it is, the farther the signal arrives) and the strength of the equipment. Fixed VHFs usually operate at 25W, providing considerable distances, while laptops operate between 5W and 6W, making them ideal for short-range communications or as an emergency backup. Many modern models integrate DSC (Digital Selective Calling) technology, which allows you to send an automatic digital distress call including the exact GPS position of the boat by pressing a simple red ("Distress") button. Just as it happens for those who have to choose which walkie talkie to buy for the mountains, even at sea the quality of the hardware makes the difference between a disturbed communication and a crystalline one.
How to use the nautical VHF
If this is the first time you are in front of an on-board radio, here is a short guide on how to use the nautical VHF following the international etiquette:
Channel 16: This is the international channel for rescue and call. It must be kept listening at all times and cannot be used for private chats.
Call procedure: You call on channel 16, identify the other party, and once you have received an answer, move to a work channel (e.g. 09 or 72) to continue the conversation.
Transmission technique: Press the PTT (Push-to-Talk) button on the side of the microphone, wait for a second, speak clearly and release the button to listen. Remember to end each sentence with the word "Over".
Squelch and Volume: Adjust the squelch (the background silencer) until the annoying hiss disappears, but without exaggerating, otherwise you risk not hearing the weakest and most distant signals.
As with the CB language of truck drivers, there is also a specific language for communication with VHF in the nautical field, for example:
MAYDAY is the signal that is transmitted for immediate emergency intervention. Together with the mayday, the name of the ship, the position, the reason for the emergency and the number of the crew involved must also be communicated;
PAN PAN is a signal that indicates a request for assistance, but not an immediate danger;
SECURITE' is a signal that is launched to carry out safety communications (not necessarily in case of emergency).
Why choose Midland reliability for your marine radio
Understanding how marine VHF works is only the first step; the second is to rely on devices built to withstand the most hostile environment: the sea. Salt, humidity and shocks are the enemies of electronics. Midland designs portable marine VHF equipment, such as the Midland Arctic, that combines ruggedness, IPX7 and IPX8 waterproof certifications, and ease of use, ensuring that your voice reaches its destination loud and clear when you need it. Whether you are looking for a fixed apparatus for your boat or a floating handheld for your coastal outings, Midland has the technological solution for your safety.
Your safety at sea cannot wait.
