The ADS-C Ground Distribution Service enables a number of operational use cases that are described in the EUROCONTROL Specification for Data Link Ground Distribution SWIM Services: Provide Logon information by SWIM publication to the LS. Query Logon information from the LS. For the ACS to subscribe to logon information from the LS. For ANSPs to set and query the controlling authority status of an A/C. Consumer request to the LS to send a CM contact to a specific A/C. LS Status Monitoring.