The US Navy is seeking market research for a replacement transponder for the AN/APX-123A(V), requiring at least Government Purpose Rights for technical data and software to enable cross-platform integration and organic lifecycle sustainment. The transponder must achieve a Technology Readiness Level of at least 7 and a Manufacturing Readiness Level of at least 7, with capabilities including SIF Modes 3/A, C, Mode 5, and ADS-B Out/In. Respondents must detail Size, Weight, Power, and Cost (SWaP-C) characteristics, and provide estimated costs for quantities of 1, 101, and 501 in 2026 dollars. The Navy is interested in both a form-fit-function replacement for the existing CXP tray and a small form-factor option, with performance locations including manned and unmanned aircraft, surface, and subsurface platforms. No specific budget amount or submission timeline is provided in this Request for Information.