Automatic Transmitter Identification System (marine)

[1]The Automatic Transmitter Identification System (ATIS) is a marine VHF radio system used and mandated on navigable inland waterways in Europe for identifying the ship or vessel that made a radio transmission.

The identity of the vessel is sent digitally immediately after the ship's radio operator has finished talking and releases their transceiver's push-to-talk button.

This contrasts to the Automatic identification system (AIS) used globally on ships that transmit continuously.

The database of ATIS vessel identities is maintained by the Belgian Institute for Postal Services and Telecommunications (fr) (nl).

[2]: 44  While DSC transmissions take place exclusively on Channel 70, the ATIS digital signal is transmitted on the same VHF channel as the voice transmission: it lasts for 285 milliseconds after the PTT button has been released, using frequency modulation frequency-shift keying (FSK) between the frequencies of 1,300 Hz and 2,100 Hz at 1,200 baud.

Radio transmitter with a label indicating it will identify any transmisssions from it as coming from "PF7297" using the ATIS protocol