Abstract: A robotic work tool system (200), comprising a robotic work tool (100), said robotic work tool (100) comprising a controller (110) being configured to cause said robotic work tool (100) to operate in a first operating mode, which first operating mode is based on a current position, said current position being determined based on signals received from a position determining device (190), such as Global Navigation Satellite System device (190); determine that said received signals are not reliable, and in response thereto cause said robotic work tool (100) to operate according to second operating mode, which second operating mode is not based on a current position being determined based on said received signals.

Abstract: A robotic work tool system (200) comprising a robotic work tool (100) and a beacon marker (280), said robotic work tool (100) comprising a beacon sensor (175) configured to sense a signal being transmitted by the beacon marker (280), said beacon marker (280) marking an area (270) around an obstacle (260) in a work area (205) in which said robotic work tool (100) is arranged to operate, wherein said robotic work tool is configured to determine a proximity to a beacon marker (280) and to adapt its operation accordingly.

Abstract: A robotic work tool system (200) comprising a charging station (210) and a robotic work tool (100), said robotic work tool (100) comprising a position determining device (190) for determining a current position, the robotic work tool (100) being configured to determine that reliable navigation through said position determining device (190) is no longer possible, such as when satellite signal reception is not possible, at a time point (T1) and position and in response thereto generate an obstacle map which gives information on the position of at least one obstacle (260), determine when an area will be shadowed with regards to satellite reception based on said obstacle map, and to schedule operation of the robotic work tool (100) accordingly.

Abstract: A robotic work tool system (200) comprising a robotic work tool (100), said robotic work tool (100) comprising a position determining device (190) for determining a current position, such as through receiving satellite signals, and a navigation device (195) arranged to at least provide a compass heading, the robotic work tool (100) being configured to: determine a compass heading (CH) obtained through the navigation device (195); compare the compass heading to a true heading (TH) obtained through the position determining device (190); determine an error (e) between the true heading (TH) and the compass heading (CH); determine a robot position (XR;YR); and store the error (e) for said robot position (XR;YR) thereby generating a magnetic correction matrix.

Abstract: A robotic work tool system (200), comprising a robotic work tool (100), said robotic work tool (100) comprising a controller (110) being configured to cause said robotic work tool (100) to operate in a first operating mode, which first operating mode is based on a current position, said current position being determined based on signals received from a position determining device (190), such as Global Navigation Satellite System device (190); determine that said received signals are not reliable, and in response thereto cause said robotic work tool (100) to operate according to second operating mode, which second operating mode is not based on a current position being determined based on said received signals.

Abstract: A robotic work tool system (200) comprising a charging station (210) and a robotic work tool (100), said robotic work tool (100) comprising a position determining device (190) for determining a current position and at least one deduced reckoning navigation sensor (195), the robotic work tool (100) being configured to determine that a reliable current position is possible to determine and in response thereto calibrate at least one of the at least one deduced reckoning navigation sensor (195).