The Department of Defense, through the Naval Air Warfare Center Aircraft Division, is soliciting proposals for the Horizon Reference System intended for Arleigh Burke-class guided missile destroyers, Constellation-class frigates, and Freedom and Independence-class littoral combat ships. The procurement aims to enhance navigation and guidance systems, which are critical for the operational effectiveness of these naval vessels. This solicitation is particularly focused on clarifying that no pricing is required for the Contract Line Item Numbers (CLINS) at the Multiple Award Contract (MAC) level, ensuring that proposals can be submitted without dollar values in Section B. Interested parties can direct inquiries to Kelly Gray at kelly.e.gray13.civ@us.navy.mil or Melissa Bucci at melissa.a.bucci.civ@us.navy.mil for further information.