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BOSTON (AP) -- The search for the wreckage of EgyptAir 990, based so far on sophisticated guesswork, became more precise today with the arrival of a survey ship loaded with high-tech equipment. // The search for the plane's wreckage and the 217 people it carried, and for answers to why the jet crashed in the ocean off Nantucket, involves technologies and techniques similar to those used after the Swissair Flight 111 and the TWA Flight 800 disasters.