Question

Dolphins use echolocation to judge how far away a fish or object is. This is most like what kind of human technology?

Answer 1

Dolphins create a click sound which travels away, bounces off every thing, and returns at different times depending on how far away the things are. Humans do use this sense. In experiments where people are put into rooms that absorb all sound (do not echo), people quickly begin to feel disoriented, panicky, and can eventually start to hallucinate. Search "the world's quietest room".

Dolphins use echolocation as well as we use our eyes. The closest we can get to understanding how this works is by thinking about how our two eyes, located in different points, receive light from slightly different angles and send those two images to our brain which get pieced together creating a sense of dimensionality. We see a 3D image of light as dolphins see a 3D image of sound.

The word echolocation is great, as it literally means "using echos to locate things".
Another great word is sonar, which is short for "sound navigation ranging" or "using sound for navigation by finding the range (distance) of things".
Submarines use sonar to navigate but I think what you teacher is fishing for, is an answer that includes fish.

Fishing boats use sonar to locate fish and objects underwater.