A torpedo guidance method using sound waves emitted by a target to determine its location and trajectory.

A guided bomb is a munition that uses a guidance system to modify its flight path in real-time to ensure accuracy.

A watercraft capable of independent operation underwater, primarily used for naval warfare, research, or exploration.

Designation for intercontinental ballistic missiles (ICBMs) deployed and launched from submerged submarines.

Missile guidance system where commands are transmitted via a physical wire link between the launch point and the missile during flight.