The Department of Defense, through the Naval Surface Warfare Center Panama City Division (NSWC PCD), is seeking information on advanced navigation solutions for uncrewed underwater vehicles (UUVs) and uncrewed surface vehicles (USVs) that can operate without Global Navigation Satellite System (GNSS) support. The focus is on localization techniques that can function in environments where prior maps are unavailable, utilizing various sensing modalities such as acoustic, electro-optic, and magnetic technologies. These solutions are critical for enhancing inertial navigation systems to reduce drift or enabling autonomous localization through methods like loop closure, particularly for military applications in challenging conditions. Interested parties are encouraged to submit their capabilities, including product descriptions and technology details, by November 26, 2024, to Brandon Hayes at brandon.d.hayes11.civ@us.navy.mil, with the understanding that this request is for planning purposes only and does not imply any commitment to procure or pay for the information provided.