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Send ADS-C Message From To Type To plane: Request periodic Request events Cancel reporting To ground: Report Reject Data    (nr. of seconds, or report content) Logon Code Make Persistant     (re-request this report when plane comes back online later) Brief Manual ADS-C reports need to be requested by a station first. When both the station and the aircraft agree to exchange reports, this is called a contract (hence ADS-C). You request a contract by sending the aircraft a message using the editor above. There are two types of contract: periodic (every N seconds) and events (when something specific happens, such as a descent). For the moment, only periodic reports work. If you are BAW and the aircraft is BAW744, you send an ADS-C report request by filling in the call signs above, select "Request periodic", and put 300 in the Data box for a 5-minute report cycle. More often is usually unnecessary, as ADS-C is not radar. It is not intended to do air traffic control (we have ADS-B for that, which is a technically totally different system). If you want to tell the plane to stop sending reports, send it a "Cancel reporting" message. If the aircraft cannot accept your contract request, or if the pilots switch ADS off (using the ATC COMM, LOGON/STATUS page), you get a "reject" message. If you check the "Make Persistant" box, your report request will be made persistant. It will be automatically re-sent to the plane a few minutes after the callsign comes online. If you cancel your report request with this box checked, you cancel the persistance. If a plane rejects the request, it will not be offered new requests, until it drops offline for more than five minutes.