® | Appendix |
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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:
Depth = Distance between FNLP and RNLP
Divider
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:
Depth = | 11.5 ft | = 7.66 ft or approximately 7.7 ft (2.35 m) | |
1.50 | |||
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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 |
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DigiTrak® Mark III Operator’s Manual | 79 |
