SONAR is mostly used by

SONAR, an acronym for Sound Navigation and Ranging, is a technology that utilizes sound waves to detect and locate objects underwater [1]. It is primarily used by navigators, including those on ships and submarines, to map the seafloor, identify underwater hazards, and navigate through challenging maritime environments [2]. While active sonar emits acoustic pulses to measure the range and orientation of objects via echoes, passive sonar is used to detect noise from other vessels or marine life [1]. Navigators rely on these systems because sound waves travel significantly further in water than radar or light waves [1]. Although doctors use similar ultrasonic technology for medical imaging, it is referred to as ultrasound rather than sonar in a clinical context. Therefore, the primary professional group associated with the use of sonar for travel and exploration is navigators [1].

Sources

1. [1] https://oceanservice.noaa.gov/facts/sonar.html
2. [2] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 92: World Constitutions > UNION LIST (LIST-I) > p. 708