User's Manual

DIGITAL CONTROL INCORPORATED
DigiTrak Falcon
™
F5

Operator’s Manual 47
Locate line does not equal the location of the transmitter
Being over the locate line does not mean you are over the transmitter, which may be to
the left or right anywhere along the locate line. You must find the front and rear locate
points to find the transmitter, as is detailed on the next couple pages.
The most accurate tracking requires the use of all three locations to determine the position,
heading, and depth of the transmitter. A line passing through the FLP and RLP reveals the
heading and left/right position of the transmitter. The LL determines the position of the
transmitter when the receiver is properly aligned between the FLP and RLP (on the line).
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.
The line marked LL in the bird’s-eye view image suggests the receiver will display a locate
line any time it is positioned on this plane. To prevent inaccurate locates and potentially
dangerous conditions, it is imperative to first find the front and rear locate points. Do not rely
on the peak signal along the locate line.
Note Whenever the transmitter is pitched, the position of the locate line will be
somewhat slightly ahead of or behind the transmitter’s actual position.
This slight fore/aft offset will increase with depth (see Appendix C). In
these cases, the depth displayed on the receiver is referred to as the
projected depth.
RLP
LL
FLP
Surface of
ground
Drill rig
Bore path
70°
RLP
FLP
Drill rig
Bore path
Transmitter
Bird's-eye view
(looking down)
Side view
LL
Transmitter