Depth Calculates how deep the water is, so that you can avoid running aground. Easy To Install Mounted inside the hull, installation is easy and requires no holes to be drilled in the hull. Dual Frequency Works at 50 kHz and 200 kHz for good target detail in shallow water and excellent bottom tracking in deep water. Highly Accurate Provides extremely accurate data. Deadrise Adjustment Accomodates deadrise angles from 2° to 22°. No Holes Reduce the risk with this simple "no holes" solution with zero hull protrusions. Plug & Play Connection Easily connect to NSS, NSE or NSO.