Soccer has finally adopted what Wimbledon tennis organizers -- never known as a bastion of liberalism -- adopted for service line calls in 1980. The International Football Association Board has
finally decided that soccer should use goal-line technology, approving two systems for testing.
Hawk-Eye (bought by Sony last year) has been used -- not without some controversy -- in sports such as cricket and tennis. GoalRef has been tried out in the Danish SAS Ligaen.
Hawk-Eye relies on six or seven cameras and software that tracks the precise position of the ball. Thanks to three microchips placed inside the ball, GoalRef uses low magnetic waves around the goal to monitor for any change in the magnetic field on or behind the goal line.
The process of signaling one of the officials takes less than a second.