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JAMB Geography 2020 Paper

Question : 46

Total: 80

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

Solution:

Concept:

A compass traverse requires the compass to be held horizontally, not vertically, for accurate readings.

Explanation:

Option A is a precaution: avoid magnetic materials near the compass.

Option B is a precaution: back bearing must differ from forward bearing by exactly

180^{\circ}

Option C is a precaution: remove all magnetic materials from the body and pockets.

Option D is not a precaution: the compass must be held horizontally, so the card does not rub against the top.

Holding it vertically would cause errors and is incorrect.

Answer:

D. The compass must be held vertically so that the edge of the card does not rub against the top of the compass.

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