MARCES-1 & CAT-4

The MARECS (Maritime European Communications satellite) satellites were members of Inmarsat's first-generation global maritime communications network. The program began as the experimental Maritime Orbital Test Satellite (MAROTS) in 1973 but was subsequently changed to an operational system resulting in a name change, a satellite redesign, and delayed development. ESA operates MARECS for Inmarsat.

CAT-4 is an Italian payload used to control the proper operation of the launcher and to send the flight parameters to the engineers. It worked perfectly well.