In 1957, Darrell Lowrance established the company LOWRANCE and intro- duced the first portable fishfinding device for fisherman in the US. Quickly, this instrument became a "magic box" for American fisherman and changed their fishing habits completly. Since this revolutionary invention, LOWRANCE has developed a wide product range of advanced but nonetheless reasonably priced, and easy to handel fishfinders, combined fishfinders / GPS and GPS+WAAS chart-plotters. LOWRANCE is one of the leading brands on its market. One mentionable reason for this success is the diversification of its product range. Today, LOWRANCE designs products that provide the user with high- performance features at very competitive prices.