Which of the following is not a precaution to be taken when making a compass traverse?

A The bearing should not be observed from a position close to strongly magnetic materials
B The 'back' bearing should be taken from the other end of the line and should differ from the 'on'/'forward' bearing by exactly 180\(^{o}\)
C All magnetic materials should be removed from the body and pockets of the reader before the bearing is taken
D The compass must be held vertically so that the edge of the card does not rub against the top of the compass

Correct Answer: Option D

Explanation:
The compass must be held horizontally, so that the edge of the card does not rub against the top of the compass