SONAR stands for (So)und (N)avigation (A)nd (R)anging. Because sound travels farther through water, it is an ideal method of detecting the bearings and distances of objects below sea level, by emitting sound pulses and measuring the time lapse and direction of echoes which are reflected back. read more
Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in Submarine navigation) to navigate, communicate with or detect other vessels. read more