Echosounder and Sonic depth finder

Sonic depth finder and echosounder are semantically related in sonar topic. In some cases you can use "Sonic depth finder" instead a noun "Echosounder", when it comes to topics like echo sounder, sounder.

Sonic depth finder noun - Depth finder for determining depth of water or a submerged object by means of ultrasound waves.

Echosounder and sonic depth finder are semantically related in sonar topic. You can use "Echosounder" instead a noun phrase "Sonic depth finder", if it concerns topics such as echo sounder, sounder.