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In order to train with mid-frequency active sonar (MFAS), the United States (U.S.) Navy has obtained a permit from the National Marine Fisheries Service (NMFS) under the Marine Mammal Protection Act and Biological Opinion under the Endangered Species Act. The Mariana Islands Range Complex (MIRC) Monitoring Plan was developed with NMFS to comply with the requirements under the permits. The monitoring plan and reporting requirements provide science-based answers to questions regarding whether or not marine mammals are exposed to, and react to, Navy MFAS and explosives. As such, the Navy developed the MIRC Monitoring Plan to conduct activities that meet these monitoring goals.