How To Use A VHF Radio
A VHF marine radio is one of the most important safety tools that boaters should have onboard their vessels. Whether you’re cruising along the coast or heading offshore, knowing how to correctly use a marine VHF radio can make the biggest difference in an emergency on board. These devices can help you communicate effectively with marinas, bridges, and other boaters while out on your vessel. America’s Boating Club | United States Power Squadrons will walk you through everything you need to know about using a radio VHF marine system safely and with confidence.
What Is a VHF Marine Radio?
A VHF marine radio is a communication device that uses very high frequency (VHF) signals in order to transmit voice communications over bodies of water. These radios are specifically designed for marine environments and operate on designated VHF radio marine frequencies that are reserved for maritime usage.
You can typically find two main types onboard:
- Fixed-mount boat VHF radio systems
- Portable units like a marine VHF portable radio or handheld VHF radio
Both types can serve the same purpose, but portable radios are especially useful for backup or small vessels.
Understanding VHF Radio Frequencies
Before using your VHF radio, it is important to understand VHF radio frequencies and how they are organized. Marine radios operate on specific VHF radio marine frequencies that are internationally recognized.
Key channels include:
- Channel 16 (156.8 MHz): Emergency, distress, and hailing channel
- Channel 9: Secondary hailing channel in some areas
- Working channels: Used for ongoing conversations after initial contact
Always monitor Channel 16 when you’re underway, as this is the primary safety channel used by Coast Guard and other boaters.
Basic Operation of a Marine VHF Radio
Using a marine VHF radio is straightforward once you are aware and understand the basics.
- Turn on and Set Volume
Power on your boat VHF radio and adjust the volume to a level that is comfortable. Make sure you can clearly hear incoming transmissions.
- Adjust Squelch
Set the squelch control to eliminate any background static while still allowing transmissions to come through clear.
- Select the Correct Channel
Choose the appropriate channel based on your specific needs. Use Channel 16 for initial contact, then switch to a working channel when you need continued communication.
- Use Proper Radio Etiquette
When speaking on a radio VHF marine system:
- Press and hold the transmit button
- Speak clearly and slowly
- Release button to listen
Always identify who you are calling and who you are. Here is an example: “Harbor Master, Harbor Master, Harbor Master, this is vessel Sea Breeze…”
Making a Routine Call
To contact another vessel or marina using your VHF marine radio:
- Tune to Channel 16
- Call the vessel or station 3 times
- Identify your vessel
- Request a switch to a working channel
Here is another good example: “Marina Dock Office, Marina Dock Office, Marina Dock Office, this is vessel Blue Wave on Channel 16, requesting Channel 68.”
Once you have been acknowledged, both parties can switch to a designated channel and continue the conversation.
Emergency Procedures
Knowing how to make a distress call is critical when you are out on your vessel and using a Marine VHF radio.
- MAYDAY Call (Distress)
This call is used when there is immediate danger to life of the vessel.
Say “MAYDAY, MAYDAY, MAYDAY This is vessel [vessel name repeated 3 times] Position, Nature of distress, Number of people onboard, Description of the vessel, If you have life jackets and are you wearing them. Any additional information”
- PAN-PAN Call (Urgent)
This call is used for urgent situations that are not immediately life-threatening.
Used for urgent situations that are not immediately life-threatening.
- SECURITÉ Call (Safety)
Used to broadcast important safety information, such as water hazards or navigation.
Always use Channel 16 for these calls and follow established VHF radio marine frequencies protocols.
Want to automate the process? Be sure your marine VHF radio has a MMSI number, it is properly registered, and it is connected to other navigational equipment on board. This automated function is built into fixed mount VHF radios manufactured since 1999. They can be identified by the red distress button on the front of the radio. Taking these steps is not only good seamanship, it is required by federal law.
Your Partners in Maritime Safety
While America’s Boating Club | United States Power Squadrons local squadrons are best known for boating safety courses, they also offer vital resources for modern maritime communication.
Our local squadrons can simplify the process of obtaining a Maritime Mobile Service Identity (MMSI) number. This 9 digit digital “fingerprint” is required to activate your VHF radio’s Digital Selective Calling features. By registering your MMSI, we can ensure that in an emergency your precise GPS coordinates and vessel data is instantly transmitted to the Coast Guard. Join a local squadron today!
Tips for Effective VHF Radio Use
- Keep transmissions short and clear
- Avoid unnecessary chatter on Channel 16
- Always listen before transmitting
- Use standard marine terminology
- Ensure your marine VHF radio is properly maintained and charged (if applicable)
Boating Safety Education
Learning how to use a VHF marine radio is an essential skill that every boater should know. From routine communication to emergency situations, understanding VHF radio frequencies and proper procedures will ensure a safe trip out on the water. Whether you rely on a fixed boat VHF or a marine VHF portable radio, practicing good radio etiquette and staying familiar with VHF radio marine frequencies will help you communicate with confidence.
For more boating safety tips and education, explore resources from America’s Boating Club | United States Power Squadrons.
Learn about our classes and seminars now!