The robot vacuum cleaner navigates using what Evolution Robotics call the North Star Navigation System. This system ensures optimal floor coverage by tracking where the unit has been so that it is does not redo areas that have already been cleaned. Also, on-board sensors stop the unit from falling off edges or running into raised rugs or other obstacles.
After the main sweeping or mopping has been done, the Mint does a final "perimeter sweep" cleaning along baseboards and the edges of furniture. A number of robot hoover owners have indicated that the edge cleaning abilities of this robot are very good and that it manages to clean right up to the baseboards and furniture. When finished the Mint parks itself at the point in the room where it started. The machine can even work in the dark as the North Star Navigation System and on-board sensors don't require light. However it should be noted that if one changes the cloth during cleaning the unit will lose its place and will have to start over to ensure it covers the intended area properly.
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