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By Shahabuddin Amerudin Geographic Information System (GIS) software has significantly advanced the way we approach mapping and spatial analysis, providing essential tools for converting between various coordinate systems. One of the key innovations in this field is the Malaysian Coordinate Transformation Program, developed in 1998 at Universiti Teknologi Malaysia (UTM). This program remains a crucial tool for professionals working with geospatial data in Malaysia. This article offers an in-depth exploration of the coordinate transformation process from the global WGS84 system to the local Malaysian systems, such as the Malayan Revised Triangulation (MRT), Rectified Skew Orthomorphic (RSO), and Cassini-Soldner systems. Understanding