The Distributed Integrated Ocean Prediction System (DIOPS) is a PC-based wave, tide and surf prediction system designed to provide DoD customers accurate and timely surf predictions for any world-wide location provided adequate bathymetry is available. Regional and coastal wave predictions are made by the nearshore wave model SWAN; receiving offshore boundary conditions from the Fleet Numerical Meteorology and Oceanography Center (FNMOC). Tide and storm surge predictions are made by PCTIDES, a relocatable 2-D barotropic ocean model that assimilates tidal constituent data. A 0.25° resolution global tide model, Finite Element Solutions 99 (FES99) is used to provide tidal conditions on open boundaries. A one-dimensional surf model, SURF3.2 generates surf predictions based on wave and tidal information from SWAN and PCTIDES. SURF3.2 can be run with a sediment-based beach profile (e.g., fine sand) or in-situ profiles. Wind forcing obtained from FNMOC is used to force all DIOPS models. Water levels from PCTIDES are used to adjust bathymetry in the wave and surf modules. The Dynamic Information Architecture System developed by Argonne National Laboratory provides the object-oriented framework that allows the models to exchange needed information. DIOPS3.0 is run on a Windows PC with a minimum of 1 GB RAM and a 2.5 GHZ processor. The DIOPS GUI allows for easy set-up with a feature to save “scenarios” for repeated runs. DIOPS3.0 has been loosely coupled with the Delft3D modeling system for 2-dimenionsal surf predictions; providing the U.S. Navy a new capability to predict the location and strength of rip-tides.