To opt out, change the SSID (name) of your Wi-Fi access point (your wireless network name)
so that it ends with _nomap. For example, if your SSID is 12345 you would change it to 12345_nomap.
- Make a physical connection between your access point and your computer with an Ethernet cable.
- Find the default gateway of your connection:
- On Windows, type "ipconfig" into the command prompt (on the Start menu).
- On Mac OS, type "ifconfig" into the command prompt.
- On Linux, type "ifconfig" into the command prompt.
- After you have the default gateway (it looks like 192.168.0.1), type it into the address bar of your web browser, like Chrome or Firefox. This step will take you to the control panel for your access point.
- If asked to sign to your access point's controls, enter the right username and password. See the instructions that came with your access point. After you’ve changed your SSID, re-establish a connection to the network using its new name. You can take this step from any devices using Wi-Fi, like your laptop or mobile phone. If your network is secured with a password, use the same password.
To help ensure your changed SSID is submitted to Google quickly, open Google Maps on an Android device with Wi-Fi turned on. To establish a location fix near your Wi-Fi access point, tap My location My location.
Originally posted in google support center under title Control access point inclusion in Google's Location services so that you won't see it; ever.