The magnetic compass has been a crucial navigational tool for around a thousand years or so, perhaps longer. While classical versions still work perfectly well, you can now get digital ...

Now think of a digital compass. They work by measuring the pull ... These should be available in your programming language of choice. Arduino (used here) makes use of the avr-libc math library ...

Watch the video below to learn more about this awesome DIY Arduino watch that uses a GY-87 sensor board, that offers three sensors in the form of HMC5883L for the compass, BMP085 for the pressure ...