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Appendix
Calculating Depth Based on
Distance Between FNLP and RNLP
It is possible to estimate the transmitter’s depth should the information displayed in the depth/distance
window become unreliable. This is only possible if the pitch and negative locate points are reliable and
the ground surface is level.
To estimate the transmitter’s depth, first measure the distance between the FNLP and the RNLP. 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’s pitch. Then use the following formula to esti-
mate the depth:
Divider
RNLPandFNLPbetweenDistance
Depth =
For example, if the transmitter’s pitch is 34% then the corresponding divider value (from the table) is 1.50.
In this example, the distance between the FNLP and the RNLP 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)
Depth Estimation Table
Pitch Divider Pitch Divider Pitch Divider Pitch Divider
0 1.41 26 1.47 52 1.62 78 1.84
2 1.41 28 1.48 54 1.63 80 1.85
4 1.42 30 1.48 56 1.64 82 1.87
6 1.42 32 1.49 58 1.66 84 1.89
8 1.42 34 1.50 60 1.68 86 1.91
10 1.42 36 1.51 62 1.69 88 1.93
12 1.43 38 1.52 64 1.71 90 1.96
14 1.43 40 1.54 66 1.73 92 1.98
16 1.43 42 1.55 68 1.74 94 2.00
18 1.44 44 1.56 70 1.76 96 2.02
20 1.45 46 1.57 72 1.78 98 2.04
22 1.45 48 1.59 74 1.80 100 2.06
24 1.46 50 1.60 76 1.82
DigiTrak
®
Mark III Operator’s Manual 79