Instant Depth Readings, Updated 4 Times Per Second... Why the HawkEye® In-Dash Sonary System? Today%u2019s 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 useful boat sonar data. However, the technology used to decipher between these different signals coupled with the configuration of their specialized transducers greatly reduces their ability to give instant bottom readings. The HawkEye® DF1000D Digital Marine depth sounder is engineered to give precise depth readings from 2.5 to 200 (.7 to 60.9 M) feet, at speeds up to 63 mph (101 kph). Say goodbye to the days of not knowing the depth while running your boat on plane.