Day One (8.6): 2016 Olympics for Android
There are many preliminary rounds happening today, but there will be medals awarded in Shooting and Fencing and Swimming gets started in earnest.
The way the app is designed gives the user their relative location to all of the activities of the day - so if you are at the early rounds of Beach Volley Ball and were thinking about going to Fencing or Swimming - you'd know exactly how far you are.
The specific event has a live Google Map that will take you to the event in question, and has details on the events of that sport on day one.