Lakemaster VX Premium. Both products now include SmartStrike technology as a feature allowing anglers to enter search parameters like season time of day temperature and targeted fish species to create a custom chart that highlights areas of the map where fish are most likely to be biting. LakeMaster and LakeMaster Premium also include customizable Chart Presets Depth Highlight Shallow Water Highlight Water Level Offset and One-Boat Network capability. And for an added advantage LakeMaster Premium includes two additional features: 2D Shaded Relief and Aerial Imagery. Specifications for Lakemaster VX Premium: Manufacturer: Humminbird Length: 7 in Additional Features: No Height: 0.5 in Package Contents: Lakemaster VX Premium