1. Ocean Associates, Inc., 4007 N Abingdon Street, Arlington, Virginia 22207, USA
2. Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, 8901 La Jolla Shores Boulevard, La Jolla, California 92037, USA
3. Joint Institute for Marine and Atmospheric Research, University of Hawaii at Manoa, 1000 Pope Road, Marine Sciences Building 312, Honolulu, Hawaii 96822, USA
4. Marine Ecology and Telemetry Research, Seabeck, Washington 98380, USA