Quartermaster 2nd Class Chance Gorden, from Baker City, Ore., takes bearings with a telescopic alidade on the signal bridge aboard the Nimitz-class aircraft carrier USS John C. Stennis (CVN 74). A telescopic alidade magnifies objects to assist with navigation. John C. Stennis is underway to Naval Station North Island for a scheduled port visit and to embark Carrier Air Wing 9 for a strike group sustainment exercise.