Marine fauna operate in visually restricted waters with great efficiency plus many species navigate over tens to thousands of km ranges annually. While they use a host of sensory cues to achieve this, acoustics or listening, offers clues at all scales. Such clues may be of biologic or physical origin. At the small, perhaps out to 1 km scale, individual sounds from invertebrates and fish can be localised by other fauna. In the deep ocean coherent whale signals can transmit to almost 200 km making the definition of a ‘group’ somewhat different to human perception. Invertebrates, fish and whales are known to produce choruses which can be detected into many km to 1000’s of km for deep sound channel ducted whale choruses. Long range physical cues are common in the deep ocean. Examples are presented of an unknown noise source in the 3-18 kHz band which appeared to emanate from a large Antarctic krill swarm, evening fish choruses along the Western Australian coast which propagate tens km and during the 2019 Indian Ocean cruise, breaking wave noise from the southern end of the Abrolhos Islands tracked over two days out to 200 nautical miles (370 km).