The NorthStar Navigation System works like an indoor GPS that helps Mint keep track of where it has been and where it needs to go. Specifically, the NorthStar Cube projects a signal that Mint uses to determine its location. Then as Mint starts cleaning, it builds a map of the area as it goes, marking walls, obstacles and drop offs as it encounters them.
Using the NorthStar Cube as a reference point, Mint can map and clean up to 800 square feet either in a large open space or by discovering adjacent rooms. In mop mode, the cleaning area is restricted to optimize cleaning while the cloth is wet