A week before the collision a Chinese frigate came within 100 yards of an unarmed US surveillance ship and aimed its gunfire control radar, telling the crew it could not operate inside China's 200-nautical-mile coastal zone.
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The "'Western Electric M-33 Antiaircraft Fire Control System "'( " M-33 fire-control system ", " Antiaircraft Fire Control System M33 ", " AA FCS M33 " ) was an X-Band " Gunfire Control Radar ", for aiming antiaircraft artillery by computer control.