Maretron CKM12 Keypad w/CKM to NMEA 2000 Adapter Cable - 0.2M (Horizontal Orientation) [A3802-2]CKM12 Keypad with CKM to NMEA 2000 Adapter Cable 0. 2M (Horizontal Orientation) The CKM12 is a customizable keypad featuring laser etched legends and LED function lights for each button. The LEDs also provide diagnostics when fault conditions are detected. With the rugged mechanical packaging (IP69K), the CKM12 can be installed inside or outside the cabin. The low profile design offers a seamless dashboard look, and it can be mounted either vertically