Indoor navigation deals with navigation within buildings. GPS reception is normally non-existent inside buildingsa other positioning technologies are used here when automatic positioning is desired. Wi-Fia Bluetooth or mobile devices are often used in this case to create a so-called "indoor GPS system”. Contrary to GPS systema howevera they also enable you to determine the actual floor level with indoor navigation methods. Most applications require an "indoor routing" functionality that guides people precisely through a building using an indoor navigation app and in this waya automatically determines their position – very similar to the navigation systems that we use in our cars.