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A long-term passive acoustic monitoring program was initiated in 2011 by the United States Navy Pacific Fleet in waters off Guam and the Commonwealth of the Northern Mariana Islands to investigate the acoustic occurrence of cetaceans in support of the Mariana Islands Range Complex (MIRC) monitoring plan. Four ecological acoustic recorders (EARs) were deployed at two sites off Guam, one at Saipan and one at Tinian, in September 2011 and again in April 2012. EAR recording durations ranged from 63 to 119 days during the first deployment (September 2011–January 2012) and 16 to 168 days during the second deployment (April–September 2012). An EAR deployed southwest of Guam was unrecoverable after the second deployment.