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Locating
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Finding the Transmitter and Its Depth
7. While standing on the FNLP facing the drill, it is possible to “sight in” or align the FNLP with the
RNLP. This axis line is at a 90° angle (perpendicular) to the PLL. Where this axis line crosses the
PLL is where the transmitter will be found, below ground surface.
Take the receiver to the transmitter’s location and measure the depth of the transmitter. The receiver
must be parallel to the transmitter when it is directly above it to get an accurate depth. It does not
matter if the receiver faces the drill or faces away from the drill. The receiver may either be held or
set on the ground to find the depth, but be sure the ultrasonics are set correctly (see “Ultrasonic
Function” in the Receiver Section). Do not hold in the trigger.
It is usually preferable to maintain separation between the receiver and the ground to minimize
underground interference sources. Setting the receiver on the ground is more likely to result in
inaccurate depth information in most situations.
RNLP
FNLP
PLL
Drill
RNLP
FNLP
PLL
Drill
Receiver Facing Toward Drill Receiver Facing Away from Drill
Receiver Position for Measuring Depth of Transmitter
Receiver
RNLP
FNLP
Transmitter's
Location
PLL
Axis Line (dashed)
Sited Between
FNLP and RNLP
Drill
Finding the Transmitter’s Location
48 DigiTrak
®
Mark III Operator’s Manual