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Radio-controlled bullets leave no place to hide - tech - 04 June 2009 - New Scientist
The US military is developing 25-mm explosive rounds that can detonate a predetermined distance from the target. The gun uses a laser range finder to determine the distance to the target, and the shooter can add or subtract up to 3 metres from the target distance. The bullet contains a magnetic transducer that generates an alternating current as it flies through the earth's magnetic field, allowing it to calculate the number of rotations it has made and, but extension, the distance it has travelled. They hope to field-test prototypes by 2012.