Use to take advantage of the advanced GPS capability of all GPS ready or combo products.Connect to Matrix unit to see position, breadcrumb trail, speed and other GPS features. Receiver mounts on standard 1" x 14" marine thread. 20' cable and hardware included. For use with: Matrix and 787c2, 777c2, 767, 737, 727, 931c, 937c, 947c 3D, 981c S.