Google will determine and store the location of any Wi-Fi access point whose SSID (name) does not end with "_nomap".
To improve Location services and estimate the location of a device, Google uses publicly broadcast Wi-Fi information from wireless access points and GPS, cell tower, and sensor data. This data is limi
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A lot of routers allow you to switch off ssid broadcast, the usual thing to do then is magnet a QR code onto the fridge door for visitors.