Summary:The Interactive Multisensor Analysis Training (IMAT) project is aimed at improving the preparation of operational users of undersea-warfare sensor systems. The effort has focused on training at all levels from initial individual training ashore through team, platform, and collective training at-sea, at all skill levels from apprentice sensor operators to senior tactical commanders. Operators and tacticians at all levels need a deep and scientifically accurate, but not necessarily formal, understanding of the physical principles that underlie tactical employment of their sensors. IMAT systems use model-based scientific visualizations, including three-dimensional graphics and animations, to illustrate complex physical interactions in mission-relevant contexts, and to provide interactive virtual laboratories in which the principles can be explored. Concepts in instruction include radiated acoustic characteristics, propagation in range-dependent environments, and sensor properties. Training systems provide exploratory environments in which operators and tacticians can examine the effects of change in any of the variables involved in the end-to-end sequence of emission, transmission, reflection and detection. Sensor settings, environmental conditions, and target characteristics can all be modified through a "what-if" simulation approach. These technologies have been applied effectively in basic and advanced sensor operations/employment courses; in individual and team training simulators, and in on-board training. At the battle-group and theater level, new-technology systems are used for decision support during at-sea exercises and operations, and for post-event reconstruction and performance analysis. This paper describes the IMAT training philosophy and approach, the design of training systems, and training effectiveness.

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