Investigators are trying to determine whether a San Diego sailor passed Navy secrets about security weaknesses and warship movements to a British man accused of having terrorist links, according to court documents unsealed yesterday. E-mail messages from the unnamed sailor, sent in late 2000 and 2001 before the Sept. 11 terrorist attacks, were found in December in computer files belonging to Babar Ahmad, who was detained Wednesday in London, according to the 31-page arrest affidavit. The computer files contained details about security arrangements and movements of the San Diego-based Constellation carrier battle group, which included the destroyer Benfold, on which...