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
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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.
A sub spotter is typically called a Submarine Sonar Technician or Sonar Operator. Their role is to detect and locate enemy submarines using sonar technology.
Do boats use sonar. Yes they do.