Marc Derfoldy represents UNK and races in the the region sailing circuit. Since March 2025, 10 races across 1 regattas have been recorded for Marc. Marc's primary class has been Hunter, with additional appearances in other fleets. Key performances include winning the SailingSA events in the multiple fleets fleet, along with the SailingSA events in the multiple fleets fleet. Marc remains active in regional dinghy racing.