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Identification Friend or Foe (Wiki:IFF) "It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster." This key idea is that the interrogation signal needs to be something the enemy can not easily generate. If the enemy found a way...
Signaling Submarines One way a surface ship or aircraft can signal a submarine is to drop small explosive charges in a timed pattern. There needs to be a prearranged meaning to the pattern. A much safer way to do this is using the Mk 84 SUS which makes use of audio tones rather than...