Sonar and Viewfinder

Sonar noun - 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.

Viewfinder and sonar are semantically related in locating device topic. In some cases you can use "Viewfinder" instead a noun "Sonar".

Viewfinder noun - Optical device that helps a user to find the target of interest.

Sonar and viewfinder are semantically related in locating device topic. You can use "Sonar" instead a noun "Viewfinder".