I get the impression that many Gen Zers like to know where everyone is all the time. It's totally normal for them to have each other's GPS locations. Snapchat has a built-in map feature where you can watch your friends move around in real time, and there are other apps that offer this, too. I was blown away when I learned this was so commonly used and people just leave it on, so their social group just knows precisely where they are all the time.