sonar is used to measure distance between objects and get a picture of a solid object via sound waves, like dolphins use, or bats. I think that it is usualy used underwater.
If you want to measure distance, you would have to make a calculation based upon the time that the sound is emitted, then received, after being reflected back by a solid object.
To "see" with it, you would need something a lot more advanced than an oscilliscope, i have no idea how that is done.
On an oscilliscope though, all that you would see is a sound wave. I don't think that there's any way of doing much with sonar using an oscilliscope.
i dnt know much about this subject so i might be wrong :lol: