My wife asked me about her phone giving her ETAs when she leaves home at a certain time of day. She said even though she had just gotten a new job it was still giving her an ETA to her old work location and it made me realize that I haven't seen this feature on my own devices in quite some time. Had completely forgotten about them actually. I tried Googling to get it turned on but it seems the method to enable it has changed from iOS 10. It used to be "Frequent Locations" and that's no longer an option under Location Services. The closest I can find to it is "Significant Locations" but that was already on when I went in and it doesn't seem to be preserving any data. Any ideas?