It should be mentioned that there are multiple "norths." And while it's generally not a big deal for most uses, if you feel that you need a compass so bad that

It should be mentioned that there are multiple "norths." And while it's generally not a big deal for most uses, if you feel that you need a compass so bad that you have to implant it into yourself, you probably want the most accurate system that you can have. I don't see anything about this on their website. Such as how do you set Magnetic declination? (My guess, you don't). The earth's magnetic filed is an incredibly complex system. I know this is more about the "implantability" rather than the compass, but still, something to keep in mind. For more information: https://en.wikipedia.org/wiki/Magnetic_declination https://en.wikipedia.org/wiki/Magnetic_declination https://en.wikipedia.org/wiki/Earth's_magnetic_field https://en.wikipedia.org/wiki/Earth's_magnetic_field