Security researcher Will Strafach intercepted the traffic from an iPhone running the latest version of AccuWeather and its servers and found that even when the app didn’t have permission to access the device’s precise location, the app would send the Wi-Fi router name and its unique MAC address to the servers of data monetization firm Reveal Mobile every few hours. That data can be correlated with public data to reveal an approximate location of a user’s device.

We independently verified the findings, and were able to geolocate an AccuWeather-running iPhone in our New York office within just a few meters, using nothing more than the Wi-Fi router’s MAC address and public data.

Source: AccuWeather caught sending user location data — even when location sharing is off

Around the same time Sonos is ignoring privacy as well, it looks like everyone is basically just taking the piss with your privacy.