The magnetic marker switch is responsible for detecting the magnetic markers. It has a sensing distance of up to 10 cm. For optimal performance, the marker switch arm should be adjusted in height so the switch is centered on the magnetic marker. The arm length should also be adjusted so the switch is as close as possible to the magnetic markers but without hitting them when the robot moves.

The current status of the magnetic marker switch is shown on the start screen. A big blue dot means a marker currently is detected.