The sonar image can be displayed as a picture in picture on the CCTV screen. The sonar and video image show what is above and below the water. The PIP window is scaleable and can be positioned in 9 different positions on the screen. The main screen and PIP window can be swapped to show details of the sonar image. Also the sonar overlay image can be turned on and off as needed. The images are recorded on video tape and in digital format to DVD’s.