straight from the marcum website:
It’s all about the engineers.
Our engineers are military trained in sonar expertise. These engineers are fishermen too. By combining superior training with 20 years of experience and the love of the game MarCum has the ability to develop serious angling tools. Formed in 1991 our engineers are part of the ownership group.
Based in Anoka, Minnesota MarCum Technologies holds numerous patents in sonar design. We’ve also developed the original Polar Vision in 1995 and have had a hand in Outdoor Viewing Systems, and Mammoth Outdoor Products. MarCum is a growing and evolving company working hard to design and market the best available outdoor products. Our products are customer driven. From battery chargers and monitors to fishing sonar and underwater viewing systems MarCum is always developing products to make your outdoor experiences more successful and fun!
Our entire product line including the LX-5, LX-3tc, LX-2, LX-1 and LX-i sonars and our underwater cameras the VS 560 and VS 460 are designed, manufactured and tested right here in the USA. The new LX-5 brings together our experience, workmanship and design functionality to allow the fisherman to choose a new versatile tool to catch more fish and have more fun. At MarCum, our engineers are avid outdoorsmen and when they’re not fishing they’re in the lab designing new products to make your outdoor experience more enjoyable and more successful.