Welcome to the U.S. Navy's website for the Gulf of Alaska Navy Training Activities Supplemental Environmental Impact Statement/Overseas Environmental Impact Statement (EIS/OEIS).

The Navy is announcing its intent to prepare a supplement to the 2011 Gulf of Alaska Navy Training Activities Final EIS/OEIS and the 2016 Gulf of Alaska Navy Training Activities Final Supplemental EIS/OEIS.

The Navy is proposing to continue periodic military readiness activities in the Gulf of Alaska. These activities include the use of active sound navigation and ranging, known as sonar, and weapon systems that may use non-explosive or explosive munitions at sea in the Gulf of Alaska Study Area . These activities would be performed while employing marine species mitigation measures. 

The purpose of this Supplemental EIS/OEIS is to update the 2011 and 2016 impact analyses with new information and analytical methods the Navy developed and has used since 2016. New information includes an updated acoustic effects model, updated marine mammal density data, and evolving and emergent best available science. 

The Navy is not proposing new activities or an increase in activities from current levels. Proposed training activities are similar to those that have occurred in the Gulf of Alaska for decades and are consistent with those analyzed in the 2011 and 2016 impact analyses.

The Navy is preparing a Supplemental EIS/OEIS to renew required regulatory permits and authorizations under the Marine Mammal Protection Act and the Endangered Species Act. Current federal regulatory permits and authorizations expire in April 2022.