I won't explain what a PicAxe is - look it up on Google :>

This board and the components does the following

1. Recieve distance from the Sonar
2. Calculates the distance and works out the angle to sets the cameras
3. Activate the servo's and move the camera angles in or out.

It also provides a patch point for the camera feeds, the video goggles, the OSD board, and the light sensor to turn on the IR spotlights for night vision