User's Manual

DIGITAL CONTROL INCORPORATED
16 DigiTrak F5 Operator’s Manual
Locating Basics
Locate Points (FLP & RLP) and Locate Line (LL)
The F5 receiver locates the transmitter by detecting three specific places in the transmitter’s
magnetic field: the locate points and the locate line. The locate points are indistinguishable
from one another by the receiver. They represent similar points in the transmitter’s field in
front of and behind the transmitter. The front locate point (FLP) is ahead of the transmitter,
and the rear locate point (RLP) is behind the transmitter (see Appendix B on page 37 for
more information about the transmitter’s magnetic field).
The locate line (LL) extends 90° to the left and right of the transmitter (perpendicular) when
the transmitter is at 0% pitch, and represents the location of the transmitter between the FLP
and RLP.
The most accurate tracking requires the use of all three locations to determine the position,
heading, and depth of the transmitter. Aligning the FLP and RLP reveals the heading and
left/right position of the transmitter. The LL determines the central position and depth of the
transmitter when the receiver is properly aligned between the FLP and RLP.
Geometry of FLP, RLP, and LL from Top (Bird’s-Eye) and Side Views
Note how the RLP and FLP are equal distances from the LL when the transmitter is level.
LL
FLP
RLP
LL
FLP
RLP
70°
Bird’s-eye view
(looking down)
Side view
Transmitter
Transmitter
Drill
Axis line
Drill
Surface of
ground