I think I understand what Captain Magic is saying. I thuink it is this.
1. Focus on the radar blip on the PPI radar. 2. When the PPI radar is focused on the blip, move the camera to the A radar view and click the focus knob to see the range.
That makes sense. Two views: PPI for bearing and A radar for distance. I will check it out. I never understood it, and could not get the A focus to work.