User's Manual

DIGITAL CONTROL INCORPORATED
Appendix C:
Calculating Depth Based on
Distance Between FLP and RLP
It is possible to estimate the transmitter depth should the information displayed on the receiver become
unreliable. This is only possible if you know the transmitter pitch and the positions of the front locate point
(FLP) and the rear locate point (RLP) and if the ground surface is level.
To estimate the transmitter depth, first measure the distance between the FLP and the RLP. The pitch of
the transmitter must also be reliably known. Using the Depth Estimation Table below, find the divider that
most closely corresponds to the transmitter pitch. Then use the following formula to estimate the depth:
Divider
RLPandFLPbetweenDistance
Depth 
For example, if the transmitter pitch is 34% (or 18.8°) then the corresponding divider value (from the
table) is 1.50. In this example, the distance between the FLP and the RLP is 11.5 ft (3.5 m). The depth
would be:
7.66
1.50
ft 11.5
Depth 
ft or approximately 7.7 ft (2.35 m)
Table C1. Depth Estimation Table
Pitch ( % / ° ) Divider Pitch ( % / ° ) Divider Pitch ( % / ° ) Divider
0 / 0.0 1.41 34 / 18.8 1.50 68 / 34.2 1.74
2 / 1.1 1.41 36 / 19.8 1.51 70 / 35.0 1.76
4 / 2.3 1.42 38 / 20.8 1.52 72 / 35.8 1.78
6 / 3.4 1.42 40 / 21.8 1.54 74 / 36.5 1.80
8 / 4.6 1.42 42 / 22.8 1.55 76 / 37.2 1.82
10 / 5.7 1.42 44 / 23.7 1.56 78 / 38.0 1.84
12 / 6.8 1.43 46 / 24.7 1.57 80 / 38.7 1.85
14 / 8.0 1.43 48 / 25.6 1.59 82 / 39.4 1.87
16 / 9.1 1.43 50 / 26.6 1.60 84 / 40.0 1.89
18 / 10.2 1.44 52 / 27.5 1.62 86 / 40.7 1.91
20 / 11.3 1.45 54 / 28.4 1.63 88 / 41.3 1.93
22 / 11.9 1.45 56 / 29.2 1.64 90 / 42.0 1.96
24 / 13.5 1.46 58 / 30.1 1.66 92 / 42.6 1.98
26 / 14.6 1.47 60 / 31.0 1.68 94 / 43.2 2.00
28 / 15.6 1.48 62 / 31.8 1.69 96 / 43.8 2.02
30 / 16.7 1.48 64 / 32.6 1.71 98 / 44.4 2.04
32 / 17.7 1.49 66 / 33.4 1.73 100 / 45.0 2.06
DigiT
rak
®
LT2™ Operator’s Manual 67