In situ simulation, or simulation in the environment where the event would normally occur, is a new concept in nursing education and for ongoing professional education for Registered Nurses in New Zealand. The literature shows many beneficial outcomes of simulation use in the student population including an increase in confidence, improvements in psychomotor skills and also improvements in communication skills. Although in the student population simulation is well described, the benefits and outcomes of simulation in the ward environment for graduate nurses is still developing and research is particularly scarce in the New Zealand context. This study aimed to answer the question ‘What are registered nurses experiences of how in situ simulation contributes to their ongoing clinical skills?’ Three semi-structured interviews were completed from Emergency Department nurses recruited from a local institution. Thematic analysis of the interview transcripts revealed an improvement in registered nurses psychomotor skills, communication skills, clinical decision making skills and teamwork. It was also reported that realism, transparency and the feelings evoked by being involved in in situ simulation facilitated the participants’ learning. Within the reported findings the outcomes from in situ simulation included a task-management focus for less experienced nurses, transferring to a team-management approach, where nurses could focus on communication and clinical decision making skills, for nurses with more clinical experience. Although these findings were present they should be taken tentatively due to the small-scale nature of the study. Further research into the outcomes for registered nurses ongoing clinical development from in situ simulation should be completed in a larger cohort, in particular the differences in outcomes based on the nurses clinical experience.