Marc Stewart         Senior Physicist         EIS Department         Applied Physics Laboratory         University of Washington	This new Rapid Transition Prototype program has been selected for funding in FY04-FY06. It builds on SPAWAR's Geoacoustic Inversion Toolkit (GAIT) program and carries inversion forward into an operational prototype system. The program's objectives are to transition the integrated GCCS-M geoacoustic algorithm segments to fleet TDAs. The purpose is to: 1) efficiently and with sufficient accuracy extract geoacoustic parameters; 2) to the extent that the measured data allow, resolve the ambiguity of inverted solutions that arise from limited grazing angle sampling; 3) with the inverted data, provide critical operator feedback on data utility based on the character of the local inversion process; 4) distinguish the regional distributions of bottom properties to support the development of bottom property probability distribution functions; and 5) interpolate and extrapolate inversion solutions into adjacent regions including a measure of uncertainty.