METHOD AND ARRANGEMENT FOR ASSISTING CONTROL OF FOREST WORK MACHINE

The invention relates to a method and forest work machine () making use of it, by means of which the control of the forest work machine is assisted. In the forest work machine, a light source () is adapted, which may be directed to one or more different parts of the surroundings around it, forming the working area of the forest work machine. This is adapted to produce at least one specifically defined specified-form light pattern () on said working area. With such a light pattern, visual information content may be produced on the working area to support an operator of the forest work machine in their work. As content of such information, it is possible to define control measures for the forest work machine, performed in any working area or their restrictions.