Starting in the 1970s, companies such as General Instrument (now SeaBeam Instruments, part of L3 Klein) in the United States, Krupp Atlas (now Atlas Hydrographic) and Elac Nautik (now part of L3 Communications) in Germany, Simrad (now Kongsberg Maritime) in Norway and RESON in Denmark developed systems that could be mounted to the hull of large ships, and then small boats (as technologies improved and operating frequencies increased).
Simrad Yachting, a manufacturer of marine electronics for the leisure and professional markets
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Simrad Optronics, a Norwegian company that manufactures defence equipment
The brand name Simrad became known in the communications business, and was leading in echo sounding equipment.
Navico now owns those three brands in addition to the Eagle, Lowrance, B&G, and Simrad lines.