Active sonar

"Active sonar sends out a special type of sound wave whenever you press the L3 button."

- Sigint

Active sonar is a piece of equipment Naked Snake uses during the Virtuous Mission and Operation Snake Eater. When used, it will send out a special type of sound wave. The active sonar then uses those waves to calculate and display the position of nearby guards and animals. Contrary to the motion detector, the active sonar also displays things that are not moving. However, when the sound waves are sent out, nearby guards may hear the device, resulting in them being more cautious or approaching Snake's location.