User's Manual

®
Vermeer
®
DigiTrak
®
L
T
™
Operator’s Manual 33
Locating Instructions
The DigiTrak LT Locating System is easy to use, but there are basic principles that must be understood
before you begin to operate the system. This section gives important information regarding the depth or
slant distance; the locate points and locate line; the geometry of these elements with respect to the
transmitter; and the proper method for marking locate points once they are found. It then describes the
standard locating procedure and an alternate technique referred to as the plus/minus method.
Depth or Slant Distance
When the receiver is held directly above the transmitter, the distance to the transmitter is referred to as
the depth. At any other location, the distance is referred to as the slant distance. When the depth is dis-
played, there will always be arrows pointing up and down from the depth reading. If the arrows are not
displayed, then the reading is actually the slant distance.
Locate Points (FLP & RLP) and Locate Line (LL)
Two of the three locations used for locating are points that represent extensions of the transmitter. One
point is in front of the transmitter (the front locate point or FLP), and the other is behind the transmitter
(the rear locate point or RLP). The third location is a line that represents the position of the transmitter.
This line, referred to as the locate line or LL, is perpendicular to the transmitter.
Geometry of FLP, RLP, and LL from Top and Side Views
Note how the RLP and FLP are equal distances from the LL when the transmitter is level.