High sensitivity gain adjusting function, clear fish-ID detection, multiple alarm modes: depth, voltage, fish& temperature. Pause screen brush map, move the cursor measurement of arbitrary target location. Automatic measuring range & bottom recognition, various display modes to show sonar return and the zoom view of bottom. Modular design and performs with high stability. The default setting will not lose. Real Time Sonar (RTS) Windows display. User-friendly Windows Setting, like Large ditits view, Selectable background colors etc.