At the Pacific 2004 show in Sydney, the Australian company Nautronix displayed its HydroAcoustic Information Link (HAIL), which it sees as a text-based replacement for the usual underwater telephone, which garbles its messages so often that it is called a "say-again machine." Nautronix argues that by substituting text for voice, HAIL drastically improves the reliability and clarity of underwater communication. It considers HAIL attractive because it can use the unmodified transducers of existing underwater telephones: the new elements are the device producing the waveforms going into the transducer and the signal processor at the other end. Because such devices are relatively inexpensive, there is no great barrier to installing HAIL. In the current context of U.S. naval tactics, HAIL or an equivalent offers far more; it may become a key enabler of network-centric undersea warfare. Nautronix has made no such claims, but the possibility seems to be inherent in the characteristics of its system.
World Naval Developments: New System Could Be Key To Network-Centric Undersea Warfare
By Norman Friedman, Author, The Naval Institute Guide to World Naval Weapon Systems