Olympic Games or World Championships set in a sprint event must be timed by a FAT system to be valid.

Hand times, i.e. those with humans operating the stopping and/or starting mechanisms, are highly prone to error. By rule, they are only accurate to a tenth (.1) of a second, so all 100ths of a second beyond zero must be rounded to the next highest tenth.

Many track and field statisticians use a conversion factor estimate of 0.24 seconds added to any hand-timed mark in the 100 m

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