Unfortunate, I had to use this app when my highschool offered a Europe trip during the summer. The shit barely worked anyway because most of us had shoddy service or didn't have a plan where we could have our data on 24/7, so it wouldn't be able to update our location often. It'd make it look like a kid was 3 miles away from the hotels we stayed at, and one time two girls almost got in trouble during curfew cause the app wasn't updated.
I really wish there were OSS apps out there that let people track their friends/loved ones, because I totally get it, sometimes you can't call/text at that moment. Hell, if they get kidnapped you might have a chance of finding them if they still have their phone on them.