Question
Download Solution PDFIf the fore bearing of a line is S 43° E, its back bearing will be
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
We know the relationship between FB and BB
Back bearing (BB) = Fore bearing (FB) ± 180°.
+ve sign is used if FB is less than 180° and –ve sign is used if FB is more than 180°.
Calculation:
Given,
FB in WCB = 137°
BB = 137° + 180° = 317° (N 43° W in quadrantal bearing)
Important Points
- Whenever there is any station affected by local attraction, then the difference between the fore bearing and back bearing is not equal to 180°
- If the difference is exactly 180°, the two stations may be considered as not affected by local attraction
- If the difference is not 180°, better to go back to the previous station and check the fore bearing
- If that reading is the same as earlier, it may be concluded that there is a local attraction at one or both stations
Last updated on Mar 26, 2025
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