Are you thinking of ADS-C for the Atlantic & South Pacific? Similar name, entirely different technology.
A long time ago I remember seeing a number of aircraft coming into Brisbane from the South Pacific. Was told at the time they are installing a system to transmit gps position via VHF as they had no radar coverage. Was told this was due to them note having ground based radar, just procedural.
Not sure may have been Fiji, think they have gone with ADS-B now.