Marine VHF Radio Frequencies: A Comprehensive Guide

Marine VHF Radio Frequencies: A Comprehensive Guide

Very High Frequency (VHF) marine radios are essential communication tools for mariners, providing a reliable means to contact other vessels, coast guards, and harbor authorities. Understanding the specific frequencies allocated for maritime use is crucial for safe and effective communication.

Why VHF for Marine Communication?

• Line-of-sight: VHF signals travel in a straight line, making them ideal for short to medium-range communication over water.
• Reliability: VHF radios are robust and reliable, even in harsh marine environments.
• Regulatory compliance: The use of VHF radios for maritime communication is governed by international regulations.

International VHF Marine Radio Channels

The International Telecommunication Union (ITU) has allocated specific frequencies for maritime use within the VHF band. These frequencies are divided into channels, each with a designated purpose.

• Channel 16 (156.800 MHz): This is the international calling and distress frequency. All vessels must monitor this channel while underway.
• Channel 70 (156.525 MHz): Dedicated for DSC (Digital Selective Calling) distress and safety calls.
• Working channels: Channels 13-15 and 17-27 are typically used for working communications between vessels.

Key Points to Remember:

• Frequency pairs: Some channels use a pair of frequencies for transmission and reception.
• Regional variations: While the international channels are standardized, regional variations may exist, especially for local traffic or specific services.
• DSC: Digital Selective Calling is an automated system that allows for distress alerts and other messages to be sent digitally.
• Watchkeeping: Mariners must maintain a proper listening watch on the appropriate channels.

Best Practices for Using VHF Radios

• Monitor Channel 16: Always monitor Channel 16 when underway.
• Use clear and concise language: Be clear and concise when transmitting.
• Identify yourself: Always identify your vessel's name and call sign.
• Respect others: Avoid unnecessary chatter and be respectful of other users.
• Follow regulations: Adhere to all local and international regulations governing VHF radio use.

International VHF Marine Radio Channels and Frequencies