Walkover System Mean?
A walkover system consists of a transmitter and receiver that enables operators to locate a horizontal drilling path. The transmitter is located just behind the drill bit and the receiver is a hand-held unit. An operator holds the receiver above the ground above the point where the drill bit is located and can follow the path of the drill even though the excavation is happening below the surface.
Trenchlesspedia Explains Walkover System
A walkover system can monitor both the depth and direction of a horizontal drill thus giving operators real-time feedback and enabling constant adjustment of the drilling direction. Even if the terrain does not allow an operator to follow the path, the operator can move around a difficult area and pick up the location of the drill on the other side or a road or body of water. As walkover system uses electromagnetic fields, and there are limits to the depth at which they can measure. They can also be affected by interference from electrical cables.