How could this have happened? Especially given that the captain and navigator had access to a remarkable array of high-tech navigational equipment. The official report concluded that the navigator had misread some data and failed to access other sources that would have alerted him to the danger. He had come to believe that the reefs they were fast approaching were underwater mountains— called sea mounts— the peaks of which were some forty meters below the surface. In making that assessment, he had not attended to a signal given by one important piece of equipment called a C-Map.