Provide power to your electronic control unit (ECU) with Garmin's ECU power cable. Simply wire the electronic control unit power cable to your boat battery as one of the last connections made during GHP installation. Compatible with the GHP 12 and GHP 20 marine autopilot systems. Easy connection with threaded collar. Cable measures 8' long. Compatible with GHP 12 & GHP 20 autopilots Easy connection with threaded collar | Garmin Electronic Control Unit Power Cable For GHP 12/GHP 20