Set up a recipient and an ETA ("estimated time until arrival"), and they'll be automatically notified when you're Almost There!
Example usage scenario:
You're taking an Uber to go meet your friend. You tell him you're on your way and that you'll be there in 20 minutes. He lives 5 minutes away from your destination, so he tells you to let him know when you're 5 minutes away. You're lazy/have better things to do, and don't want to keep checking your phone. You could send him your live trip details, but he's lazy/has better things to do, and doesn't want to keep checking your location updates. Let Almost There tell him when you're 5 minutes away!