Humminbird 4068201 AS InterLink Network Connection Shares GPS, waypoint, and route info between compatible plotters Does not pass fishfinder data May be daisy-chained to accommodate multiple units Allows you to share GPS position, waypoints, routes and your current track between two Humminbird Fishing Systems in real time Compatible with 900, 700 and Matrix series fishfinders Includes InterLink, hardware and product manual One year limited warranty 72 year limited warranty