This working group of the Partnership for Observation of the Global Oceans (POGO) implemented specific elements of the IQOE Science Plan related to capabilities of POGO member institutions. This working group (1) led an effort to create an Essential Ocean Variable (EOV) related to sound, for use by the Global Ocean Observing System; and (2) revised the list of passive acoustic observing assets first presented in Appendix 2 of the IQOE Science Plan and made this updatable online.