advances in computing bring to the forefront the numerical model as an alternative means to obtain high resolution, up-to-date forecasts of tidal elevations and currents. Such models can ingest recent bathymetric measurements and include transient meteorological effects such as wind and atmospheric pressure. The spatial and temporal density of the forecast information can be readily tailored to specific applications and needs. This paper contains details regarding the design of a tidal forecast system subject to the constraints of an operational environment. Specifics of the Navy's tidal prediction system are addressed with descriptions of the numerical prediction models, examples of operational products and results from recent validation tests of the operational forecast system. The paper concludes with a look at recent developments of the modeling system that will likely advance the future operational tidal prediction capability of the Navy. Tidal Prediction Strategy Design Criteria A number of desired criteria come to mind in considering the design of a tidal forecast system. Foremost, a model forecast system should produce accurate values of the tidal heights and currents where accuracy is defined by some predefined range of error. A second characteristic of a successful prediction system is its portability across computer platforms. A machine-independent numerical modeling system can adapt readily to rapid changes in the availability of computer platforms due both to technological advances and user resources. A final criterion is one of mobility. A relocatable model forecast system affords more flexibility to meet the needs of multiple users in relation to the variety of geographic regions and spatial scales desired. The operational environment poses a number of

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