The GEMS Search and Rescue tracking system SARTRAK, driven by the GEMS 3D Coastal Ocean Model (GCOM3D), has now gone into operation at the Australian Maritime Safety Authority in Canberra.  The system combines hydrodynamic modelling and object tracking algorithms, with real-time numerical weather prediction from Bureau of Meteorology forecast models, and oceanographic data sensing (CSIRO) to produce state-of-the-art probabilistic search areas based on environmental data error analyses.  AMSA reports that the performance of the system is meeting its high expectations and that GCOM3D and SARTRAK have provided a significant improvement in the information available for determining search areas.