NOAA intends to award a sole source purchase order to the University of Notre Dame to modify the depth-averaged water density engine, Advanced Circulation (ADCIRC), to provide global grids and multi-year water level products for tidally-referenced airborne operations. The period of performance is from October 1, 2026, to September 30, 2027. The work supports NOAA’s National Geodetic Survey and will improve tidal window predictions for aerial imagery, enabling more accurate mission planning and post-flight verification. The University of Notre Dame is the original developer of the ADCIRC ocean model, and no other vendors can meet NOAA’s operational requirements for tidally-referenced aerial imagery. The location for performance of services is not specified.