User's Manual

DIGITAL CONTROL INCORPORATED
DigiTrak F5 Operator’s Manual 43
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