http://dsc.discovery.com/tv-shows/discovery-presents/videos/ultimate-guide-to-submarines-sonar.htm
I like the use of sonar, espically in submarines. the sonar travelling through the water and reflecting off the surfaces until it hits something else in the water and rebounding back to its postion.
This is really helpful as it also gives an estimation of how far away something is and time destination to get in range, or to a point.
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