A detailed description of the HYCOM ocean prediction system is available at http://hycom.org/dataserver/goml0pt04/expt-31pt0. The HYCOM configuration used for the Deep-C MapViewer has a 1/25 equatorial resolution, a latitudinal resolution of 1/25cos(lat),and 20 coordinate surfaces in the vertical. This system uses the Navy Coupled Ocean Data Assimilation (NCODA) system (Cummings, 2005) to assimilate ocean variables obtained through satellites and in-situ measurements. The system runs at the Naval Oceanographic Office (NAVOCEANO) Major Shared Resource Center,and the output of each run is saved to CF-compliant NetCDF.