Marthinus Groenewald represents UNK and races in the the region sailing circuit. Marthinus's earliest SailingSA result dates to February 2025. Since then 2 races across 1 regattas have been recorded. Marthinus competes mainly in the Miura fleet, alongside races in other fleets. Highlights include winning the 2025 Mykonos Offshore Regatta in the Miura fleet, along with the 2025 Mykonos Offshore Regatta in the Miura fleet. Marthinus continues to build experience across competitive sailing regattas.