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[PSUBS-MAILIST] SONAR



Okay,
 
I have a question about "civilian" SONAR.  I have seen fish finders in action but I never really understood what I was looking at.  I saw a little picture of a boat and then the water under us.  And a couple fish :)     I'm wasn't really intrested in the fish but the technology when I saw this at the tender age of...???  um??? like 12? I think?
 
Anyway my question is.... when OI saw it it a apeared as a 2d section...  a plane straight down from the boat....  Now this image may have deviated a little from what I actually saw in my memory, but if that is what I saw then that doesn't seem very useful for our purposes.
 
Basiclly, what i'm asking is: Can someone explain to me how fish finders work.  Not the fundamental PING and Return time with the calculation involving time, distance, and the speed of sound in water, but in what type of plane does the ping get read. 
 
In otherwords, it ping in 3D, but is it read in 3D and if so, how is that displayed using a 2D display.....  I hope I have explained my queston sufficiently.
 
Adam