Earliest records show a spoon shaped compass made of lodestone or magnetite ore, referred to as a "South-pointer" dating back to sometime during the Han Dynasty (2nd century BCE to 2nd century CE).

like a compass. As a bonus, parents or pet owners can also set up “safe zones” to be alerted when a wandering child or animal leaves a given area. Unlike smartphones, LynQ doesn’t require a ...

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 ...