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 effectively without Global Navigation Satellite System (GNSS) support. The primary objective is to identify localization techniques that 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 the primary contact, Brandon Hayes, at brandon.d.hayes11.civ@us.navy.mil, with additional inquiries directed to Peter Romaine at peter.d.romaine.civ@us.navy.mil.