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The idea originally proposed by two military engineers has developed into the world's leading underwater observation system and ice fishing sonar. In other words, this did not happen overnight or accidentally. Here is their story detailing their experiences and future. Marcum Tech has been working to build a better fishing vessel, the idea comes from two passionate anglers who happen to design sonar for the U.S. Navy's nuclear submarines. In early 2000, they took the development of their already successful commercial ice installations to a new level. Turning this technical knowledge into an advantage for ice anglers in the real world, they developed the LX-1, LX-3 and LX-5 sonar kits. Marcum Tech set off a revolution in ice electronics, driven by customer demand for clearer, more precise, and more feature-rich hardware.