The Department of Defense, specifically the Department of the Navy, is seeking to procure 41 units of an inertial navigation system under the presolicitation notice titled "66--INERTIAL NAVIGATION." The procurement involves a specific National Stock Number (NSN 7H-6605-015136655) and is subject to unique constraints, as the Government does not own the data or rights necessary to purchase or contract repair from additional sources, making it uneconomical to reverse engineer the part. Interested parties are encouraged to identify their interest and capability to meet the Government's requirements, with proposals due within 45 days of the notice publication. For further inquiries, potential bidders can contact Leigh E. Catchings at (717) 605-2864 or via email at LEIGH.CATCHINGS@NAVY.MIL.