Compatible with Humminbird HELIX® G3/G3N and newer, HELIX® G4/G4N, all SOLIX® units, all APEX™ units, and all XPLORE™ units. VX Technology: Provides exceptional map performance, more precise contours, and five new customizable depth color palettes, enabling you to tailor your display for optimal clarity and quickly identify fish-holding structures.
eBay