Hi, I've seen several tracking type apps whereby users can track their friends, and other apps that track the route that you run on Google Maps. I want to add a small feature to one of my apps so that your friends can send you a tracker invite, and then you can see your friend on Google Maps until they cancel the tracking. What would be the architecture behind building / designing this function. Should we just update the DB every 5 seconds with your friend's current location, and then keep refreshing your map so that you can see their new position every 5 seconds, or is there a better way to achieve this. Thanks in advance for your help.