A system for viewing at least one control space being located in a given work area associated with a frame of reference, said control space defining a volume in which a portable tool is authorised to operate, said system including: - a controller capable of transmitting parameters for carrying out a work, said tool being capable of carrying out said work according to said parameters transmitted by said controller, and having a button for starting said work; - a geolocation system capable of determining the coordinates of said portable tool in said frame of reference; - means for controlling said tool capable of receiving said coordinates of said portable tool, said control means being capable of: - authorising the operation of said portable tool, by actuating said button, if said tool is located in said control space, - inhibiting the operation of said tool, by actuating said button, if said tool is not located in said control space, said control space having a defined border, within said frame of reference associated with said work area, by coordinates recorded in the memory of said means for controlling, - a portable device separated from said tool and embedding a camera capable of capturing images of said work area, viewing means , and means for determining the location and orientation of said camera in said frame of reference, - a visual marker having predetermined location and orientation in said frame of reference, said means for determining the location and orientation of said camera in said frame of reference using the image of said visual marker captured by said camera , said portable device and said viewing means receiving said coordinates defining said border of the control space and take into account said location and orientation of said portable device to transmit, in real time, visual signals representative of said border by projecting them within the work area or by displaying them on a screen, said system then comprising said screen. - a controller capable of transmitting parameters for carrying out a work, said tool being capable of carrying out said work according to said parameters transmitted by said controller, and having a button for starting said work; - a geolocation system capable of determining the coordinates of said portable tool in said frame of reference; - means for controlling said tool capable of receiving said coordinates of said portable tool, said control means being capable of: - authorising the operation of said portable tool, by actuating said button, if said tool is located in said control space, - inhibiting the operation of said tool, by actuating said button, if said tool is not located in said control space, said control space having a defined border, within said frame of reference associated with said work area, by coordinates recorded in the memory of said means for controlling, - authorising the operation of said portable tool, by actuating said button, if said tool is located in said control space, - inhibiting the operation of said tool, by actuating said button, if said tool is not located in said control space, - a portable device separated from said tool and embedding a camera capable of capturing images of said work area, viewing means , and means for determining the location and orientation of said camera in said frame of reference, - a visual marker having predetermined location and orientation in said frame of reference, said means for determining the location and orientation of said camera in said frame of reference using the image of said visual marker captured by said camera , <EOS>