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{{about|inland vessel transmission identification|aircraft identification system also called ATIS see|Automatic terminal information service}}
The '''Automatic Transmitter Identification System''' ('''ATIS''') is a [[marine VHF radio]] system used and mandated on navigable inland [[waterway]]s 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. A short post-transmission message is sent by the radio with the vessel identity and is in the form of an encoded [[call sign]] or [[Maritime Mobile Service Identity]], starting with number '9' and the three country-specific [[maritime identification digits]].
ATIS use on the [[Trans-European Inland Waterway network]] and connecting waterways is mandated by the Regional Arrangement Concerning the Radiotelephone Service on Inland Waterways (RAINWAT) agreements, which also prohibit the use of [[Digital Selective Calling]] (DSC) where ATIS is required, except in some near-coastal areas, or in sea-like areas of The Netherlands.
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