A device for marking a distance to a golf player when playing golf on a golf course, the golf course comprising an area established for striking out a golf ball and an essentially open field, the device comprising a body adapted to be positioned in a visible manner to the golf player in said field and at a definite distance from said area, and a golf course for at least one golf player during golf play, the golf course comprising an area for striking out a golf ball and an essentially open field.