Senior Chief Petty Officer Jonathan Myers teaches Command Master Chief April Beldo how to use a marine sextant. Senior Chief Petty Officer Jonathan Myers teaches Command Master Chief April Beldo how to use a marine sextant during a demonstration of celestial navigation aboard the aircraft carrier USS Carl Vinson (CVN 70) underway in the Pacific Ocean on Dec. 7, 2010. The Carl Vinson is on a three-week composite training unit exercise to be followed by a deployment to the western Pacific Ocean. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 242836-A-OVN57-072.jpg Photo Gallery