A surveyor is conducting a compass survey between two stations, A and B. The
observed fore bearing (FB) of line AB is 124°30'. Determine the back bearing (BB) of line
BA, considering there is no local attraction.
-
A.
94°30'
-
B.
234°30'
-
C.
214°30'
-
D.
304°30
Correct Answer:
D. 304°30
Explanation:
To calculate the back bearing (BB) of a line when there is no local attraction, you use the relationship between the fore bearing (FB) and the back bearing. The rule states that the BB equals the FB plus or minus 180 degrees. Since the given fore bearing of line AB is 124°30', which is less than 180°, you add 180° to find the result. Adding 124°30' and 180°00' results in a back bearing of 304°30'. Therefore, option D is the correct choice.
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