sonar

n. method by which underwater objects are detected using transmitted and reflected sound waves; device which locates objects by means of sonar

SONAR (SOund NAvigation and R anging) — or sonar — is a technique that uses  sound propagation under water (primarily) to navigate, communicate or to detect other vessels. There are two kinds of sonar — active and passive. Sonar may be used as a means of  acoustic location.Acoustic location in air was used before radar. Sonar may also be used in air for robot navigation while SODAR (an upward looking in-air sonar) is used for atmospheric investigations.The term sonar is also used for the equipment used to generate and receive the sound. The frequencies used in sonar systems vary from infrasonic to ultrasonic.
See more at Wikipedia.org...

Soñar (English: "To Dream") is a radio single from the album Dulce Beat of Mexican Electro/Pop band Belanova.The song was released to radio on March 2006 along with "Niño", Universal Music Mexico thought it would be good idea to test more songs on the radio while "Por Ti" was still going strong on music channels."Soñar" entered at eighty-four, but it only reached seventy-six on the Mexican Top 100 Singles Chart it also entered on the Mexican Digital Sales Chart, peaking at fifty-four, the track remained inside the chart for five weeks.
See more at Wikipedia.org...

Sónar is a three day annual music festival held in Barcelona, Spain. It is described officially as a festival of Advanced Music and Multimedia Art. Music is by far the main aspect of the festival. The festival runs for three days and nights, usually starting on a Thursday in the third week of June. The fourteenth edition of the Sónar festival was held on 14th, 15th and 16th of June 2007. Annually there are around 80,000 visitors to the festival.
See more at Wikipedia.org...

Noun
1. a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; sonar is an acronym for sound navigation ranging; asdic is an acronym for anti-submarine detection investigation committee
(synonym) echo sounder, asdic
(hypernym) measuring instrument, measuring system, measuring device
(part-holonym) submarine, pigboat, sub, U-boat
(part-meronym) pinger

n. sonar, device for detecting objects beneath the surface of water by means of transmission of high frequency sound waves, asdic

n. sonar, method by which underwater objects are detected using transmitted and reflected sound waves; device which locates objects by means of sonar