1. | When the magnetic bearing of the sun at noon is 185° 20', the magnetic declination will be ? | |
2. | The magnetic bearing of a line is 55° 30' and the magnetic declination is 4° 30' west. The true bearing of a line will be ? | |
3. | The shift of a curve is equal to ? | |
4. | At the magnetic poles, the amount of dip is ? | |