Location services could be:
- GPS only (battery drain only when an app wants to use it).
- Battery saving (wi-fi location + and cell tower triangulation).
- High accuracy (GPS + wi-fi location + cell tower triangulation).
Don't know where you found "room" specified for this icon. Looks like
this icon is a near-clone of the one used in Google Maps. Not so
suprising considering whose OS is on your phone. Geo-location services
can be employed by any foreground or background process.
Just because you leave an app in Android does not mean it is unloaded.
In Windows, closing an app means it unloads. Android doesn't do that.
Go to Settings -> Applications Manager and look under the Running
column. There are probably lots of apps you through you had exited that
are still running.
http://www.howtogeek.com/166140/you-dont-need-to-install-a-task-manager-how-to-manage-running-apps-on-android/
"Properly behaved apps running in the background aren’t actually doing
anything — they’re just remaining in memory and using no CPU or other
resources. When you access them again, they’ll quickly open, as they’re
waiting in memory for you to return. If they were removed from memory,
they would take longer to re-open as their data would have to be
transferred from system storage back into RAM ..."
Well, a GPS-aware app that is still running probably still has to query
your current location for that app to do its job. So you probably still
have a location-aware app that is trying to poll for where you currently
are. Weren't you the one that was just asking about compass apps and
made an announcement about GPS Compass Basic? Well, did you leave it
running? If so, it's probably trying to use location services to figure
out where you are.
When I use Google Chrome and leave it, it is still loaded. Firefox
would do the same except it actually has an Exit function in its menu to
make sure it is unloaded when its window closes. It's been so many days
that I don't remember when I last use the Home Depot app, Wifi Mapper
app, Xfinity Connect app (for wifi calling), and even a lot longer since
I used OneDrive (I haven't used it in weeks). Some are services that
load when Android starts, some are apps that I've used before but are
still loaded despite I "closed" out of them many days ago.