Chengdu M&S Electronics Technology Co., Ltd. (688311.SS) manufactures and sells satellite navigation and satellite communication terminal equipment; provides related technical services; and develops electronic countermeasures and data link products. Satellite navigation offerings include anti-interference radio frequency components, navigation display computers, landmark pickers, anti-interference navigation receivers, portable satellite navigation simulators, and navigation jammers. Satellite communication products comprise civil aviation airborne dongzhongtong antennas, unmanned aerial vehicle dongzhongtong communication antennas, shipborne satcom-in-motion antennas, airborne satcom-in-motion antennas, car satcom antennas, and beacon tracking receivers. The company, founded in 2013 and headquartered in Chengdu, China, operates primarily in China with overseas sales; employs 400 people; and serves defense, military, civil aviation, and maritime sectors. Satellite navigation generates the majority of revenue, though both navigation and communication segments declined in 2024 to CNY77 million and CNY58.17 million, respectively, from prior years. The company reports earnings for the first quarter ended March 31, 2025, and full year ended December 31, 2024, reflecting ongoing operational focus amid market challenges; it holds national "little giant" status for specialized innovation in these technologies.