Advanced Chart Detail Detailed charts help the mariner guide their boat in and out of port with confidence. Depth Range Shading Displays high-resolution Depth Range Shading for up to 10 depth ranges so you can view your designated target depth. Detailed Contours BlueChart g2 HD features 1-foot contours that provide a more accurate depiction of bottom structure for improved fishing charts and enhanced detail in swamps, canals and port plans.
