Sound detector
Sonar is a method of sound based ranging. Therefore as an object it is not subject to an antonym. There is the principal of radar which can also range, but it uses radio waves instead.
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sattelite with sonar
Sonar
Sonar
sonar
No, the Arctic fox does not use sonar. It is not equipped with sonar.
Sonar is measured in sound
In the mountains i detect a rock with my SONAR.
Do boats use sonar. Yes they do.
SONAR: Sound Navigation and Ranging