User's Manual
Table Of Contents
- Safety Precautions and Warnings
- Dear Customer:
- Introduction
- Receiver
- Transmitter
- Remote Display
- Battery Charger
- Locating
- The Target Steering Function
- Appendix A: System Specifications and Maintenance Requirements
- Appendix B: Projected Depth Versus Actual Depth and the Fore/Aft Offset
- Appendix C: Calculating Depth Based on Distance Between FLP and RLP
- Appendix D: Reference Tables
- LIMITED WARRANTY
DIGITAL CONTROL INCORPORATED
DigiTrak
®
F2
®
Operator’s Manual 75
The Target Steering Function
The Target Steering function allows the F2 receiver to be placed out ahead of the drill head and used as
a steering target. The receiver is positioned on level ground so that it is facing in the same direction as
the drilling. To activate the Target Steering function, you must program the receiver with the desired
target depth number. The drill head can then be guided to a point directly below where the receiver has
been placed using the Target Steering screen on the remote display.
The F2 system assumes level topography for the most accurate Target Steering results. It also assumes
a conservative bend radius. Therefore, in situations with significant pitch changes, such as during the
launch/exit ends, the up/down steering information on the remote display may not be accurate. In these
situations, only the left/right steering information should be considered accurate.
Feasible Target Depth and
Positioning the Receiver as a Target
The maximum distance that the receiver can be placed out ahead of the drill head for Target Steering is
35 ft (10.7 m). Over this 35-ft range, starting with the drill head approximately level, the following
parameters apply:
The maximum depth change is approximately 4 ft (1.2 m).
The maximum pitch change is approximately 14%.
For the most conservative Target Steering operation, we assume that the ideal drill path is a circular arc
with a radius that accommodates the bend radius of most drill strings and products being installed. As
shown in the diagram below, the feasible steering area is limited to the shaded region bounded by the two
circular arcs.
Surface of Ground
Transmitter
Target
Feasible Target
Steering Area
Target
Depth
Horizontal Distance
35 ft (10.7 m) max.
Receiver
Depth Change
4 ft (1.2 m) max.
Target
Depth
Target
Depth Change
4 ft (1.2 m) max.
Current
Depth
Diagram of Feasible Steering Area
Maximum depth change is approximately 4 ft (1.2 m) over horizontal distance of 35 ft (10.7 m).