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| Region | location | year |
| Southern CA | 32- 41.3N, 119- 01.9W | 2000-01 |
| Same location | 2001-02 | |
| Same location | 2002-03 | |
| Bering Sea | 57- 00.0N, 164-59.97W | 2000-01 |
| 56- 49.9N, 163-00.5W | 2001-02 | |
| 56-51.02N, 164-03.52W | 2005-06 | |
| Hawaii | 19- 07.97N, 155-04.76W | 2000-01 |
| 18-43.33N, 158-15.23W | 2005-06* |
Years begin July 1 and end June 30 to encompass the continuous nature of singing within that period. * Duty-cycled recording: 5 min on during every 25 min.
