U.S. Navy Lt. j.g. Vanessa Walton (4th from right), navigator aboard the guided missile frigate USS Crommelin (FFG 37), explains to officers with the Cambodian navy how she uses charts in Sihanoukville, Cambodia, on Oct. 26, 2010. The visit was part of Cooperation Afloat Readiness and Training, an annual series of bilateral exercises in Southeast Asia.