A robotic cleaning device comprising: a chassis and an outer shell secured to the chassis to define a structural envelope of a height to enable movement of the robotic cleaning device under furniture; left and right main drive wheel assemblies (112L, 112R) and respective independent electric motors (114L, 114R), independently mounted in pivotally-biased combination with the chassis for pivotal motion with respect thereto at opposed ends of the transverse diameter of the chassis, and movable between a retracted position under the weight of the robotic cleaning device during operation and an extended position wherein their axes of rotation are below the bottom plane of the chassis; a navigational control system operative to monitor movement activity of the robotic cleaning device within a defined working area, the monitored movement activity including at least one of a position history of the robotic cleaning device and an instantaneous position of the robotic cleaning device; and a transmitting subsystem including a transmitter laser, wherein the transmitter laser: is configured to redirect a transmitting element of the transmitter laser; is configured to cover the defined working area by transmitting a beam substantially parallel to a surface of the defined working area; and is integrated in combination with a high point of a housing infrastructure of the robotic cleaning device so that none of the structural features of the robotic cleaning device interfere with operation of the transmitting element of the transmitter laser, the robotic cleaner further comprising a wheel drop sensor integrated in combination with each of the main drive wheel assemblies (112L, 112R) and operative to generate a signal whenever any of the main drive wheel assemblies (112L, 112R) is in an extended position. a chassis and an outer shell secured to the chassis to define a structural envelope of a height to enable movement of the robotic cleaning device under furniture; left and right main drive wheel assemblies (112L, 112R) and respective independent electric motors (114L, 114R), independently mounted in pivotally-biased combination with the chassis for pivotal motion with respect thereto at opposed ends of the transverse diameter of the chassis, and movable between a retracted position under the weight of the robotic cleaning device during operation and an extended position wherein their axes of rotation are below the bottom plane of the chassis; a navigational control system operative to monitor movement activity of the robotic cleaning device within a defined working area, the monitored movement activity including at least one of a position history of the robotic cleaning device and an instantaneous position of the robotic cleaning device; and a transmitting subsystem including a transmitter laser, wherein the transmitter laser: is configured to redirect a transmitting element of the transmitter laser; is configured to cover the defined working area by transmitting a beam substantially parallel to a surface of the defined working area; and is integrated in combination with a high point of a housing infrastructure of the robotic cleaning device so that none of the structural features of the robotic cleaning device interfere with operation of the transmitting element of the transmitter laser, is configured to redirect a transmitting element of the transmitter laser; is configured to cover the defined working area by transmitting a beam substantially parallel to a surface of the defined working area; and is integrated in combination with a high point of a housing infrastructure of the robotic cleaning device so that none of the structural features of the robotic cleaning device interfere with operation of the transmitting element of the transmitter laser, the robotic cleaner further comprising a wheel drop sensor integrated in combination with each of the main drive wheel assemblies (112L, 112R) and operative to generate a signal whenever any of the main drive wheel assemblies (112L, 112R) is in an extended position.