By appending ‘_nomap’ to the end of your Wi-Fi hotspots you could opt out of all Wi-Fi network tracking and means your hotspot will not be used for improving location fixes on mobile devices.
(only honored by google, other OSs need different approaches)
This is a terrible standard, unfortunately. This makes branded or "clever" SSID's difficult and awkward. (And Microsoft has a different standard too ...)
(only honored by google, other OSs need different approaches)