Uploaded September 2026 | Updated September 2026, 2 weeks ago
As mobile and satellite phones replaced radio phone calls, many duplex VHF channels were no longer needed for their original purpose. Some were reassigned to services such as AIS, which broadcasts vessel identity, location, course, and speed to nearby ships and shore stations.
Channel use also varies by country. In the United States, some former marine frequencies were reassigned for other purposes, so VHF radios include separate International and USA modes to prevent vessels from transmitting on channels that have changed use.
#AIS #MarineElectronics #VHFRadio #MaritimeTech #CasualNavigation
As mobile and satellite phones replaced radio phone calls, many duplex VHF channels were no longer needed for their original purpose. Some were reassigned to services such as AIS, which broadcasts vessel identity, location, course, and speed to nearby ships and shore stations.
Channel use also varies by country. In the United States, some former marine frequencies were reassigned for other purposes, so VHF radios include separate International and USA modes to prevent vessels from transmitting on channels that have changed use.
#AIS #MarineElectronics #VHFRadio #MaritimeTech #CasualNavigation
