If you want city-level accuracy, at least in US, just use geo IP lookup: https://geoiptool.com/ This finds my city perfectly, unlike the link above (which says I'm somewhere on US West coast).
I'm actually using a VPN (euro214.vpnbook.com), which, based on the name, should be somewhere in Europe. But who knows? If I disconnect the VPN, Google and Geoiptool both get my town right, and Maxmind is one town over. I'm using Verizon FiOS.
As for the geolocator, the ping times range from 172 ms (Frankfurt, Germany) to 524 ms (Singapore). Too large to be of use. With the VPN disconnected, it lucks out with a 12 ms ping to New York, resulting in a yellow circle accurately indicating that I am in the northeast US.
Looking at the no-VPN map[2], there are small circles corresponding the antipodes[3] of Singapore (purple) and Bangalore (blue). Without the New York ping, the map would be completely useless.
[1]https://dev.maxmind.com/geoip/geoip2/geolite2/