What makes the DepthTrax Boat Mounts the best selling depth finders in the world?  The answer is: Because they flat out-perform... Today’s high-tech, multipurpose fish finders are designed to produce a range of readings from bottom contour, fish location, and thermoclines, to a variety of other sonar data. However, the technology used to decipher between these different signals, coupled with the size of their specialized transducers, greatly reduces their ability to give instant depth readings. The HawkEye DepthTrax Boat Mount Depth Finders are specifically engineered to do one thing: Find the bottom and accurately display the depth. Say goodbye to the days of not knowing the depth while running your boat on plane.