There is a story that the first Chin emperor used the divining ... south orientation (the earth's axis) would become magnetic. These more refined needle compasses could then be floated in water (wet ...

This is how the British Ordnance Survey publish the magnetic offset in the margin of their printed maps. [Fair use] Every former Scout will have learned how to take a compass bearing and relate it ...

Such reversals in the Earth's magnetic field, they'd tell you ... So hang on to your compass. For the foreseeable future, it should work as advertised.—Peter Tyson ...

Until the arrival of GPS, the magnetic compass was the single most useful navigational tool available to humans. But it’s a recent invention. Although Chinese explorers understood the principles of ...