So I've been researching whatcould be the sensor/s that would do what the picture depicts: I have camera A behind camera B. What I'm trying to achieve is: to point the position of camera B when B passes on the field of view of A. When B pases in front of camera A the Screen of camera A will graphically indicate is position. If you have ever played with Combat Flight Simulator you know what I'm talking about. I would connect this sensor (as part of a board) and display the readings on the screen the same way an OSD does it. I've been looking at the way remote controls work and infrared sensor sounds like an option but I would like to hear your thoughts on this. Just so you know I'm a sophomore Mechanical engineering student so this is not my area of expertise.