It is suggested to provide a line marking device having a GNSS receiver or prism for a robotic total station. The line marking device further has at least one spray nozzle and a comparator adapted to compare a detected location to a predetermined pattern. The comparator calculates a location and/or a direction error. Further the line marking device has a prompting device for providing steering information to a user. The provided information is the location and/or direction error. The at least one spray nozzle and the GNSS receiver or the prism are in a fixed spatial relation to a connecting element, which is connected or connectable to an unmovable receiving element of a cart.

A method and system for use in the game of football to determine ball placement and position, as well as first down demarcations, is described, with various embodiments configured to track the location of a football to determine its position on the field and to determine and display the first down demarcation on the field. Certain embodiments employ software to assist in performing placement determinations, distance determinations, track movement of the ball, first down markers, as well as light emitting modules along a track that extends parallel to the field.

A line striping system comprises a chassis, wheels, a spray system, a propulsion system and a steering system. The wheels are mounted under the chassis. The spray system is mounted on the chassis. The propulsion system is mounted on the chassis to drive a wheel. The steering system is coupled to the chassis. The steering system comprises a handlebar rotatatable to steer a wheel, and a speed bar pivotable to control the propulsion system.

An odometer system for a vehicle or mobile apparatus 1 are described. The odometer comprises a distance-determining device 2 configured to transmit a beam of radiation, such as a laser beam 13 and to determine, from reflected radiation of the beam 13 off a target surface 11 remote from the distance-determining device, a measurement value of the instantaneous separation distance D.sub.m between a mobile measurement reference point 6, 11 of the vehicle 1 and a stationary measurement reference point 3 remote from the vehicle 1. The distance-determining device 2 is configured to be located at the stationary measurement reference point 3 and to direct the radiation beam 13 towards the remote target surface 11 located at the mobile measurement reference point 6, 11, and the odometer device 2 comprises communication means 7 for wirelessly communicating the measurement value to a data receiving means 7 at the vehicle 1.

A self-propelled robot unit including a navigation system and movement items for positioning of the robot unit on an even base and a system for impacting predefined areas of the base during the unit's movement between two points on the base is provided. The robot unit's system for impacting predefined areas of the base includes at least one effect unit provided by an outer side of the wheels in relation to the center axis, but upwards one of the driven wheels. An embodiment also relates to a method for creation of a plan for the robot unit's movements and placement of markings for a ball game field.

A line striping system comprises a chassis, wheels, a spray system, a propulsion system and a steering system. The wheels are mounted under the chassis. The spray system is mounted on the chassis. The propulsion system is mounted on the chassis to drive a wheel. The steering system is coupled to the chassis. The steering system comprises a handlebar rotatatable to steer a wheel, and a speed bar pivotable to control the propulsion system.

A play device for a rebound sport with a play area is provided, on which a ball can be played by a player to rebound from an impact position in accordance with a predetermined set of rules of the rebound sport, which includes a sensor system configured to detect two-dimensional first coordinates of the impact position and to transfer the two-dimensional first coordinates to a computing unit configured to determine two-dimensional second coordinates, a size and/or a shape of a target field depending on the first coordinates in accordance with a predetermined specification and to control a projector to project the target field to be optically perceptible by the player on a projection area, wherein the ball can be played by the player on the target field to rebound from the target field in accordance with the set of rules of the rebound sport.

The invention relates to a method for marking sports field by placing stripes of paint according to a predefined plan via a spraying nozzle on a level playing surface such as grass, gravel, ice, artificial grass or synthetic material field. A robot unit is provided that is configured to move along the stripes according to the predefined plan. The robot unit receives signals from a number of GPS sending units and continuously calculates its current position on the sports field, and uses the current position on the sports field to calculate a set of control signals to two or more movable elements for propulsion of the unit and for controlling the emission of paint. The invention also relates to a robot unit and use of a robot unit for marking fields.

The disclosure discloses a spraying or fuming scooter, including a pedal base, front wheels, a rear wheel, a handle rod, a water tank, a spraying device disposed on an outlet of the water tank, and a circuit control component. The disclosure disposes an electric wire in the handle rod to enhance reliability and stability of circuit control. A light-emitting printed circuit board and a spraying piece are fixated on a nozzle of the water tank manufactured by blow molding via a fixing trestle cylinder. Water is added from an inlet of the water tank. After energization, mists atomized by the spraying piece are illuminated by a LED light-emitting light group of the light-emitting printed circuit board to show the mists with various colors. The mists simulate emission from engines of airplanes, vehicles and motorcycles, which can enhance entertainment and excitement of the scooter in the disclosure.

A line marking apparatus, for use in a system that includes a source of a narrow beam of radiation which extends substantially horizontally along or parallel to a line to be marked, includes a wheeled chassis and a line marking head for dispensing line marking material. The marking head is supported on the chassis for lateral movement relative thereto, which movement is controlled by a controller that includes a detector which is movable with the marking head and is positioned and directed to detect such a beam of radiation, the marking head being movable together with the detector in response to a detected beam. Lateral movement of the marking head is thereby controlled such that the head and the detector substantially follow the line to be marked irrespective of whether the chassis deviates from the line direction.