This document provides the documentation required to obtain an Approval in Principle (AiP) for refitting the inland patrol vessel RWS 88 with a Methanol Propulsion System (MPS). The equivalent level of safety of methanol systems to conventional diesel fuel systems is to be demonstrated by means of risk assessment and engineering analysis. The approval of the design is to be carried out in accordance with SOLAS Reg 55 & MSC Circ. 1455. See also IGF Code Part A and MSC Circ. 1621 Guidelines Methanol.