The Precision of a traverse is expressed as the ratio of the “linear error of closure” to the “traverse perimeter”, and is called the “closure ratio.” A traverse that is 12,000 feet in length and does not close by 1 foot, is said to have “1 in 12,000 closure.” If that same traverse does not close by 0.10 feet, then it has 1 in 120,000 closure.