From:
http://observer.com/1999/07/radar-sh...ght-800-crash/

It would seem that even the F.B.I. secretly regarded the 30-knot track as suspicious. For six months, the Government conducted a $5.5 million trawling operation of the waters surrounding the crash, using scallop boats. Commander Donaldson has obtained documents left by the F.B.I. on one scalloper, showing that the F.B.I. was specifically looking for shoulder-fired Stinger missile parts-notably a Stinger ejector motor-in what the F.B.I. called a “possible missile launch zone” 2.7 miles from the crash. That circle included the mystery boat.