To quote verbatim: "A purple location services icon will apear next to an item that is currently using your location. A gray location services icon will appear next to an item that has used your location within the last 24 hours"
Since 5.0.1 allegedly fixed battery issues, I decided to re-enable the "setting time zone" option in the Location services menu. And for the past 25 minutes it has been actively using the GPS and I have lost 2% of my battery life in that time.
To quote verbatim: "A purple location services icon will apear next to an item that is currently using your location. A gray location services icon will appear next to an item that has used your location within the last 24 hours"