A home plate foundation form for supporting a home plate for playing baseball and softball includes, for example, an outer frame, an inner frame, and a tray. The outer frame incudes a bottom and a sidewall defining a chamber therein having an upper opening. The inner frame is supported in the chamber of the outer frame. The inner frame includes a bottom and a sidewall defining a chamber therein having an upper opening. The tray is supportable in the inner frame for adjustably supporting the home plate.

A ground marking apparatus is configured to apply marking material to a ground surface. The ground marking apparatus includes a beam supported by a beam mount and extending along a beam axis. A carriage is disposed on the beam and movable on the beam along the beam axis. A carriage motor operably interfaces with the beam and is configured to move the carriage along the beam. A dispense arm is supported by the carriage and is configured to move relative to the beam as the carriage moves along the beam.

A play surface marking system may include a first fabric strip configured to be attached to a play surface using a first adhesive strip and a second adhesive strip, wherein the first fabric strip defines a first boundary on the play surface and a second fabric strip configured to be attached to the play surface using a third adhesive strip and a fourth adhesive strip, wherein the second fabric strip defines a second boundary on the play surface.

Presented is an apparatus and system for an artificial turf system. The artificial turf system includes a backing layer having a plurality of fibers extending therefrom. The artificial turf system further includes a plurality of impact sensors located at least partially on, in, and/or beneath the backing layer, wherein the plurality of impact sensors are operable to detect a force or pressure applied to the backing layer.

A display device for showing a court line is provided. The court line is adapted to be shown on an indoor field. The display device includes field line sets disposed on a predetermined field. The field line sets have marker lines, and two or more of the marker lines overlap with each other. Each marker line includes a thin transparent body. The thin transparent body includes a protective film, a conductive layer, a light-emitting layer, an insulating layer, and an electrode layer. The light-emitting layer is made of a material including an electrochromic material. Each marker line in each field line set has an independent circuit loop. Thus, by energizing the light-emitting layer of the desired marker lines to make it emit light, the desired court lines will be shown correspondingly, thus avoiding the problem of causing users to be confused among multiple sets of court lines.

A ground marking autonomous robot containing a flexible bag containing a marking material therein, the flexible bag provided with an airtight valve outlet sealed to the flexible bag. The use of a ground marking autonomous robot with a flexible bag allows for improvements in the accuracy of the deposition of material, for example in image printing or fertiliser deposition. This allows the optimisation of material deposition, and material use, minimising environmental impact with no compromise to quality of finished product, e.g. a printed logo or a fertilised pitch.

A ring for a fighting sport has a circular fighting area defined by a plurality of circular fence rings that are held up by posts. Shock absorbers connect the fence rings to the posts. Position markers are provided to indicate the starting positions of the participating fighters at certain points during the bout.

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.

Methods and apparatus are discussed for an electric powered personal transportation vehicle with electric motors powered by one or more batteries. A set of universal battery mounting hole locations and a reserved space for one or more battery housings exist on a board for the personal transportation vehicle. The reserved space on the board for the one or more battery housings that house one or more battery packs is set to not interfere with an operation of the motors or the wheels. A first battery pack containing the one or more batteries differs in at least one of i) a different amp-hour capacity, ii) a different length, width, or height, and iii) a different shape than another battery pack designed to be physically contained in the one or more battery housings and electrically connect with corresponding electrical connections in the one or more battery housings.