The F2 is part of a drilling system used by Developers and Construction Engineers to lay out long tracks of underground cabling without having to resort to laying down trenches. The HDD (Horizontal Directional Drilling) machine operator uses the F2 remote system to direct and  track a drill-head which is outfitted with a transmitter.  As the drill-head is navigated over and around hidden underground obstacles, it pulls behind it the cabling which will be connected to the building site.