Android
Wi-Fi and Bluetooth Scanning for Location Accuracy auf Android
Android does not rely on GPS satellites alone to work out where you are. Wi-Fi scanning lets the location service detect nearby wireless networks and use their known positions as a reference point, which speeds up fixes indoors or between tall buildings. Bluetooth scanning works the same way with nearby Bluetooth devices and beacons, adding another data point when satellite signal is weak.
Both scans run independently of whether Wi-Fi or Bluetooth is actually connected to anything. That is why your phone can still detect nearby networks for location purposes even after you have switched Wi-Fi off from the quick settings panel. Turning a scan off removes that extra data source, so location fixes can take longer or land less accurately indoors, while turning it on trades a small amount of battery for better precision.
Menu path
Tap on Settings ➔ Tap on Location ➔ Tap on Location services ➔ Tap on Wi-Fi scanning or Bluetooth scanning ➔ Turn on/off Wi-Fi scanning or Bluetooth scanning
You can toggle Wi-Fi scanning and Bluetooth scanning separately, so you can keep one active and disable the other depending on how much you value battery life versus location accuracy in a given spot.