the forebearing of AB and back bearing of AB differ by 180° the forebearing of AB and back bearing of BA differ by 180° both (a) and (b) are correct. none is correct
Answer Discuss in Comment
20° 50° 160° 295°
N 66° 30' W N 23° 30' W W 23° 30' N S 113° 30' N
S 25° E 205° 335° 295°
magnetic bearing azimuth local attraction declination
77° N 23° S 13° W 13° E
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively both give QB of a line and WCB of a line both give QB of a line both give WCB of a line
loss of magnetism of the needle presence of magnetic substances near the instrument incorrect levelling of the magnetic needle friction of the needle at the pivot
traversing & resection radiation & traversing intersection & traversing all of the above
levelling, orientation & centering levelling, centering & orientation orientation, centering & levelling None
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