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The NRL Atmospheric Variational Data Assimilation (NAVDAS) is a data assimilation suite for generating atmospheric state estimates to satisfy a variety of US Navy needs.

Its implementation at Fleet Numerical Meteorology and Oceanography Centre (FNMOC) permits the Navy's atmospheric forecast systems to benefit, for the first time, from the direct assimilation of satellite radiances, which have resulted in significant forecast improvements at other forecast centres. NAVDAS has been proven to run robustly in the FNMOC operational environment On 1 October 2003, NAVDAS was operationally implemented at FNMOC as the data assimilation system for NOGAPS.