The application of an Auxiliary Propulsion Motor (APM) to an existing vessel has the ability to offer a new layer of safety and propulsion capability. Retrofitting APM to such vessels can provide a more cost-effective cruise mode as well as reversionary propulsion power for an improved capacity to deliver a safe return to port. The APM can also provide improved critical manoeuvring such as for crash stop and manoeuvring in confined waters which can be important for vessels operating inshore in areas with high tidal ranges, fast tidal flows and in close proximity to shallow areas of water. BMT has been supporting the restoration of the naval water tank vessel, the SS Freshspring which was formerly with the Royal Fleet Auxiliary. The vessel is currently in Devon, UK awaiting development to a sea-going state that will allow her to operate as a passenger vessel. The support provided support to this endeavour, includes undertaking technical feasibility studies and exploring design options for potential different regulations the vessel may have to meet. The presentation will show the results of technical studies to examine the potential benefits of the introduction of APM, and how such an addition would affect the shaftline arrangement onboard.