The Survey Department of Brunei Darussalam, with the collaboration of the Universiti Teknologi Malaysia (UTM), has carried out a study on the establishment of a new geodetic framework for the country. A new geocentric datum for Brunei Darussalam 2009 (GDBD2009) was established using GPS space geodetic technology based on the ITRF2005 reference frame. The GDBD2009 is related to ITRF2005 through the inclusion of the 8 GPS stations of the Brunei Darussalam Zero Order Network and have been processed together with more than fifty IGS stations around the world. The realization of GDBD2009 requires the determination of a new datum transformation and map projection scheme. A new set of transformation parameters to be use in converting from the existing local datum to the new GDBD2009 has been computed. The implication of this new datum on the existing cadastral and mapping practices, various GPS non-mapping applications, and the GIS/LIS related applications are taken into consideration.