Abstract: An electronic communication device for use in a navigation system. The electronic communication device comprises a first communication module arranged to communicate a first electromagnetic signal to at least one external communication device, wherein the at least one external communication device is operable to determine a physical distance between the respective external communication and the electronic communication device based on the first electromagnetic signal being received; a power module arranged to power the first communication module; and a mechanical structure arranged to at least temporally anchor the electronic communication device at a predetermined position.

Abstract: A system and a method for a grass maintenance comprising an autonomous vehicle (100) arranged to operate autonomously to manipulate a grass surface, wherein the vehicle (100) includes one or more environmental sensors (208) arranged to detect environmental conditions associated with the grass surface; and one or more grass manipulation modules (210) arranged to manipulate the grass surface.

Abstract: A docking station for use with an autonomous tool comprising a docking module for detachably receiving the autonomous tool and a guiding module arranged to guide the movement of the autonomous tool towards the docking module, wherein the autonomous tool, upon termination of the movement, is received by the docking module at a predetermined position and orientation. The present invention also discloses an autonomous lawn mower having a docking module and a guiding module and a method of guiding an autonomous tool towards a docking station. A docking station for use with an autonomous tool (100) comprises a docking module (200) for detachably receiving the autonomous tool (100) and a guiding module (210) arranged to guide the movement of the autonomous tool (100) towards the docking module (200), wherein the autonomous tool (100), upon termination of the movement, is received by the docking module (200) at a predetermined position and orientation (400).