In February 2009, the Ticonderoga-class guided missile cruiser U.S.S. Port Royal ran aground about a half mile south of the Honolulu airport. The Navy's investigation found that the ship's navigational gear was broken and that the ship's fathometer wasn't functioning. In simple terms the bridge didn't know where the ship was. The investigation subsequently discovered that the commanding officer was exhausted, sleep-deprived, and that sailors who were nominally assigned to stand watch against such incidents were assigned elsewhere in the ship to cover manning shortages.