User's Manual

DIGITAL CONTROL INCORPORATED
DigiTrak F5 Operator’s Manual 37
Appendix B: Projected Depth Versus Actual
Depth and the Fore/Aft Offset
What Happens When the Transmitter Is Steep and Deep
The signal field emitted by the transmitter, as shown in Figure B1, consists of a set of
elliptical signals, or “flux lines”. The flux lines indicate the position of the transmitter. When
the transmitter is level with respect to the ground, the locate line (LL) is directly over the
transmitterthe depth displayed on the receiver is the actual depth, and the locate points (FLP
and RLP) are at equal distances from the transmitter. The location of the LL is found at the
intersection of the ground and the horizontal component of the flux field; the FLP and RLP
are found where the vertical components of the flux field intersect with the ground. Some of
the horizontal and vertical components are identified in Figure B1 by short yellow lines.
Figure B1. Flux Field and Geometry of FLP, RLP, and LL (Side View)
RLP
FLP
LL