U.S. Army Engineer Research and Development Center Environmental Laboratory researchers Shea Hammond (front left) and Justin Wilkens (front right) on the back of a tugboat with the i3X0 EcoMapper, an autonomous underwater vehicle. A U.S. Coast Guard crew and support vessel provided support while the EcoMapper missions were underway. The EcoMapper was used to help respond to a Dredging Operations Technical Support (DOTS) request to monitor turbidity near a cutterhead dredge in the Bayou Rigaud Navigation Channel near Grand Isle, Louisiana.