Satellite navigation has revolutionized the way we get around. It’s cheap, fast and easy to use. But there’s one fatal flaw in the system: It simply can’t work underground.

GPS requires line of sight to satellites orbiting the planet. The great advantage of this is that it works seamlessly all over the world, without needing to be connected to a cellular or Wi-Fi network. This works well in open areas but in built-up areas with tall buildings, or in underground tunnels, the system can fall apart.

Bluetooth beacons offer a great opportunity for many industries to work more efficiently and improve their offering to customers. One of the most interesting applications is in the world of retail, where the phrase ‘know your customer’ is taking on a whole new meaning.

传统的人员打卡方式是使用指纹打卡，通过提前录入个人的手指指纹，在指纹打卡机上按压指纹，来实现确认人员考勤到岗。但是指纹打卡存在打卡效率低、指纹必须保持干净、有几率失败重复打卡的问题。