Instructed by the Kress RTKⁿ network , it navigates your lawn with centimeter-level accuracy. No need for boundary wire nor fixed reference antenna to be installed in the lawn. The dead reckoning algorithm ensures accuracy where lines of sight to the satellites are blocked by trees and buildings. Operated by the MAP (Mowing Action Plan™) technology, it efficiently manicures lawns up to 1 3/4 acre large (1 1/4 acre recommended).