As impressive as GPS and other radio signal-based positioning technologies are, they pretty much all crap out once the device-to-be-localised is inside. This is just a fundamental property of radio waves—put something solid enough, such…
![](https://leewebdesign.com/wp-content/uploads/2016/04/1459566833152255.jpg)
As impressive as GPS and other radio signal-based positioning technologies are, they pretty much all crap out once the device-to-be-localised is inside. This is just a fundamental property of radio waves—put something solid enough, such…