Renewable ammonia is a technically and economically promising solution for net-zero CO2-free IC engines for applications that cannot be electrified. As a major supplier of marine two-stroke engines, WinGD is releasing its first X-DF-A engines in 2025. However, stable operation of the combustion concept relies on fossil (diesel) pilot fuel assisted ignition due to ammonia's challenging auto-ignition characteristics. The project aims to investigate the feasibility of fossil-free ammonia combustion through new ignition concepts. An optically accessible engine test facility will be used to study the underlying mechanisms at engine-relevant operating conditions to evaluate alternative ignition concepts. After identification of worthwhile concepts, further examination will take place at the engine-scaled "spray combustion chamber". Finally, a recommendation regarding applicability to two-stroke marine IC engines will be provided.