They use the location heuristics of nearby Apple devices, which rely on a combination of GPS, cell towers, Wi-Fi and Bluetooth to make a guess at where they are located
They use the location heuristics of nearby Apple devices, which rely on a combination of GPS, cell towers, Wi-Fi and Bluetooth to make a guess at where they are located
If you are indoors they are going to default to cell towers and wifi because they can't get GPS signal