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Celestial Navigation (CELNAV) is one skill that has not been formally taught to Navy officers, depending on one's commissioning source, for more than 15 years. Based on direction from the Chief of Naval Operations, CELNAV has been reinstated into the navigation curriculum and is a requirement in the Officer Professional Core Competencies Manual. This administrative change ensures the instruction will be an enduring requirement. The Naval Academy resumed classroom instruction during the summer session of 2015. From autumn of next year, all newly enlisted sailors will have to study the stars and learn theories of celestial navigation during an advanced navigation course. The Class of 2017 will be the first to graduate with the reinstated instruction.