You can make your own too!
There have been several news reports of harmful effects of sonar on dolphins and whales (and other marine creatures). As Noaki Schwarz reports in LiveScience, the United States Navy may be cutting back on its use of sonar. As the Navy has decided to become more environmentally friendly, it sought the approval of the California Coastal Commission; the commission has voted to place significant restrictions on sonar use. I hope that a good compromise between military exercise and marine animal health can be found.