JAMB - Geography (2020 - No. 46)
Which of the following is not a precaution to be taken when making a compass traverse?
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
Giải thích
The compass must be held horizontally, so that the edge of the card does not rub against the top of the compass