Edson Vision Series Light Arm f/Open Array Radars [68660]Light Arm for Open Array Radars Edson's 68660 Vision Series Light Arm allows you to attach your Navigation Light to your Edson Vision Series Mount with a Open Array Radar. Light Arm extends 28" toward the stern allowing room for your Radar or Satellite Dome. The Light Arm is 28" tall, which meets Coast Guard standards for navigation lights. Edson's Light Arm requires a Light Arm Receiver that is dependent on the style of Vision Series Mount you have