A brief overview of the channels mariners and pilots must know about How VHF channels support distress, navigation, and routine operations, emphasizing the importance of standardized communication for safety and coordination. The purpose of Channel 16 is international calling and distress. Mariners must also know that A3E (double‑sideband AM voice) 121.500 MHz is the aviation emergency frequency.
There are a few essential radio Channels operators must know. Digital Selective Calling, DSC, is an automated distress alert. Channel 70 is reserved strictly for digital signaling. DSC also improves response time and reduces voice‑channel congestion. Channel 13 is used for maneuvering and passing arrangements with low-power transmissions to reduce interference. Channel 13 is the standard in most U.S. coastal areas. Working channels support for non-emergency coordination is Channel 08. It is commonly used for routine voice exchanges. Channel 28 is used to place radiotelephone calls to shore telephones.
Each channel serves a purpose in communicating needs. It is best practice to maintain proper watch and avoid misuse, and mariners should stay proficient with VHF procedures.