Goal line technology

Goal line technology is used to detect weather the ball crossed the line in the goal. These are used all over the world; six super-high-speed cameras shooting at 500 frames per second (that's 20 times faster than a normal camera) track every movement of the ball as it flies across the pitch. At least 25 per cent of the ball must be visible for the system to work. That means that if the ball went over the line in a melee of bodies after a goalmouth scramble, the system would probably not be able to make a call. Goal Ref's sensors can be implanted in just about any ball - something which will keep ball sponsors happy.  A very similar system named Cairo’s was an early front-runner for approval as a goal-line technology, but that system fell by the wayside due to the need to hold a microchip in the dead centre of expensive and specially-manufactured balls made by system co-creators Adidas. There are cons in this as well which make this not as good as it seems these are  It might be simple, but the lack of bells and whistles mean that it's simply nothing like as hot  as Hawk-Eye for TV viewers with all those replay possibilities. However, FIFA have offered that any system should only be usable by match officials - though probably only while people get used to it - which might give Goal Ref a head start.