As far as I know, they've just mudded up the language, so it's not obvious that you check "Yes, please report all my friends and associates wlan ids/location and store them in one huge database that's available to Google, law enforcement etc. And once you've clicked yes, I don't think they ask again.
In my (Sony) Marshmallow/Android 6.0 phone it lets one choose: "Location mode": "High accurancy" (Use GPS, Wi-Fi, Bluetooth or mobile networks to determine location), "Battery saving" (Wi-fi, bluetooth or mobile networks) and "Device Only" (Use GPS to determine location).
Just now noticed it says "High Accuracy" (I believe Google Maps will nag you into submission on this, if you try to use GPS only).
Don't forget the menu item "Scanning" in Settings > Location. It "improves location" by scanning wifi and bluetooth _anytime_ i.e. even when location is turned off. I like the sneaky location of the menu item (no pun intended).
It does indeed nag you and once you select "high accuracy" it will stay so forever, unless you go to settings and disable it every time. Aargh. Otherwise it just keeps asking until you allow it by mistake.
In my (Sony) Marshmallow/Android 6.0 phone it lets one choose: "Location mode": "High accurancy" (Use GPS, Wi-Fi, Bluetooth or mobile networks to determine location), "Battery saving" (Wi-fi, bluetooth or mobile networks) and "Device Only" (Use GPS to determine location).
Just now noticed it says "High Accuracy" (I believe Google Maps will nag you into submission on this, if you try to use GPS only).