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*Note* In case you don't know what Sonar is...
Basically it's underwater Radar.Sonar technology involves bouncing sound waves off underwater objects to determine what they are. Brantley said the training is needed so technicians can learn how to identify whether an object is an animal, an obstruction or a vessel.
The two sides of the argument (in a nutshell):
Pro-Sonar
Against SonarTwo officials of the Navy League, a civilian organization that supports the service, said the Navy needs the training to detect hostile submarines.....According to the Navy study, sonar is essential because of the worldwide proliferation of modern, quiet diesel submarines.
Article on the debateKeith Jenkins, a marine scientist who worked with the Navy on the study, said it might cause the animals to stop feeding or move out of an area. In some cases, he said, the sound might keep them from hearing normal sounds around them.