Echolocation systems are susceptible to interference known as echolocation jamming or sonar jamming. The submarines carry the Thales Underwater Systems Type 2054 composite sonar. Optical fibers are used as hydrophones for seismic and sonar applications. An embarked helicopter is equipped with its own dipping sonar, sonobuoys and radars. This upgrade included rebuilding the ship's superstructure, electronic systems, radar, sonar, and weapons. Reflection seismology is similar to sonar and echolocation. They were found on the Atlantic seabed using advanced sonar scanning. Dolphins search for prey primarily using echolocation, which is a form of sonar. An ROV may be equipped with Sonar and LiDAR equipment. The helicopter hunted submarines with its AQS-13F dipping sonar, and carried a 6-tube sonobuoy launcher. The original sonar and underwater telephone upgrades are limited. Tactical Towed Array Sonar (TACTAS). These whales were beached on the day U.S. Navy destroyers were activated into sonar exercise. Some versions of the class no longer have the towed sonar, or Harpoon missile launcher. Modern torpedoes are generally fitted with an active/passive sonar.