About Marine VHF
Marine VHF operates in the 156–162 MHz band with standardized international channels. It is used for ship-to-ship, ship-to-shore, and distress communications. Modern radios also support Digital Selective Calling (DSC) linked to a vessel’s MMSI number.
Frequency156 – 162 MHz
Key Channel16 – Distress & Calling
Power1 W / 25 W selectable
Range~5–20+ nautical miles
LicenseVaries by country / vessel
DSCDigital distress alerting
Critical Channels
- Channel 16 — International distress, safety and calling. Monitor whenever underway.
- Channel 9 — Alternative calling (US recreational)
- Channel 6 — Intership safety
- Channel 13 — Bridge-to-bridge / navigation
- Working channels (68, 69, 71, 72…) for routine traffic after contact is made
Always listen before transmitting. Keep calls on Channel 16 short and move to a working channel. Use low power when possible.
History
Marine VHF grew out of the need for standardized ship-to-ship and ship-to-shore communication. International agreements established Channel 16 as the global distress and calling frequency. Modern marine radios added Digital Selective Calling (DSC) and integration with GPS for automated distress alerts.
Present-Day Uses
- Safety & distress — Channel 16 and DSC are critical life-saving tools
- Harbor & marina operations
- Bridge-to-bridge navigation
- Recreational boating coordination
- Coast Guard & rescue liaison