Location Without Manual Inventory
GPS on WiFi laptops, subnet-to-site mapping on wired desktops.
Laptops with WiFi report exact coordinates through the Windows Location API. Wired desktops resolve through a subnet and gateway mapping table, with the most specific matching CIDR winning. Devices that match neither are still recorded with their raw network facts, so an administrator can extend the mapping table rather than losing the device.
Both halves of a typical fleet resolve to a real place, with no manual data entry.