Funding for this research was provided by:
U.S. Fleet Forces Command
Received: 17 October 2019
Accepted: 14 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: All survey methods were conducted under scientific research permit #16239 issued to Dan Engelhaupt by the National Marine Fisheries Service under the Marine Mammal Protection Act and Endangered Species Act. Prior to surveys, procedures outlined in the permit were reviewed and approved by an Institutional Animal Care and Use Committee as part of the Animal Welfare Act. Consent to participate is not applicable.
: Not applicable.
: JMA, DTE, MPC, and MFR are employed by HDR; AGE is self-employed via Amy Engelhaupt Consulting; TP is self-employed; and JTB is employed by NAVFAC Atlantic. The authors declare that they have no competing interests.