Marc Rothwell (right), a seasoned ice navigator and retired Canadian Coast Guard Captain, helps Lt. Cmdr. Patrick Armstrong navigate the waters of Bellot Strait in Nunavut, Canada, from the bridge of Coast Guard Cutter Maple, August 12, 2017. Rothwell has more than 36 years of maritime experience and first began navigating in Arctic waters in 1982. U.S. Coast Guard photo by Petty Officer 2nd Class Nate Littlejohn.
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