This work was supported by ONR Grant N00014-90-J-1285. I wish to thank R. Pinkel for his role in the conception and development of the phased-array sonar, and E. Slater, M. Goldin, L. Green, C. Neely, C. Bonner, D. Scarla, and A. Aja for their roles in the design, construction, and deployment of the sonar systems. I also wish to thank S. Elgar (WHOI), R. Guza (SIO), T. H. C. Herbers (NPGS), W. O'Reilly (NPGS), and B. Raubenheimer (WHOI) for providing data for comparison.
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