Depth sounder and Sonic depth finder

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

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

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