Why does Maps on my iMac need WiFi? I’m plugged in to the router with Ethernet.
It seems goofy, right? Here’s the scoop: Your internet connection doesn’t give away your exact location. (Your ISP knows your address and could reveal it to the po-po, but it’s not public info.) So Apple uses wifi to triangulate the position of your computer based on the location of wifi networks that the Mac can detect.
They did the same thing on the iPhone before it had real GPS.