MARKING DEVICE, TRAILER UNIT FOR A MARKING DEVICE AND METHOD FOR MARKING A NUMBER, LETTER OR SYMBOL

The invention relates to a marking device (10; 100) for marking a football field layout. The marking device (10; 100) comprises a drive unit (1; 101) and a trailer unit (2; 102), wherein the drive unit (1; 101) comprises a frame, at least three wheels (8a-8c, 108a-108c) for carrying the frame, in particular one line spray nozzle (11) for marking straight lines on the ground, the line spray nozzle (11), being fixedly attached to the frame or moveably attached to the frame for adjusting the position of the line spray nozzle (11), a motor (16a) for driving at least one of the wheels (8a-8c) of the drive unit (1) and/or a handle (16b) for a user to push the drive unit (101), in particular a drive unit pump (28) for pumping paint to the nozzle, and a command unit (5) for commanding the pump and/or nozzle and/or motor. The drive unit (1; 101) and the trailer unit (2; 102) are attached through a coupling, in such a way, that the trailer unit (2; 102) is pullable by the drive unit. The trailer unit (2; 102) comprises a support frame, at least one, in particular two, wheel (13a, 13b) for carrying the support frame, and at least one set of, in particular forty, symbol spray nozzles (12) for spraying a symbol on the ground, the nozzles (12) being fixedly attached to the support frame.