GMDSS Radio Survey Blog
ATIS (Automatic Transmitter Identification System) is a system used in marine VHF radios. It is mandatory for the identification of vessels navigating certain inland waterways of mainland Europe.
The ATIS signaling protocol is based on the protocol used for Digital Selective Calling (DSC), with the ATIS transmissions having the format specifier field set to 121. While the DSC transmission is exclusively on Channel 70, the ATIS digital signal is transmitted on the same VHF channel as the voice transmission.
