Sea area A1
An area within the radiotelephone coverage of at least one VHF coast station in which continuous digital selective calling (Ch.70/156.525 MHz) alerting and radiotelephony services are available. Such an area could extend typically 30 to 40 nautical miles (56 to 74 km) from the Coast Station.
Click on the read more below for a quick overview about Marinsys-GMDSS & KENTA-GMDSS A1 system.