The IOOS Model Viewer provides a platform for visualization and analysis of integrated model output. Users can examine several modeled variables together in a map-based environment, and generate time-series plots of the output. Real-time observations are also available for comparison purposes. The engine driving this visualization is the Environmental Data Server (EDS), which harvests model output from a variety of disparate sources and normalizes the output into a single format: CF-compliant NetCDF. The EDS also provides data access services through a THREDDS server, which is available through the Viewer. This product is intended for use by the marine user community, though is open for exploration by the interested public.