When I go to a group, I see Group, Discovery and Chat, what are those for?

In the group screen you can view all the info about the group including members of the group, who were invited, who were accepted, and the group type. When you click on Discovery, it takes you to the radar view of the group. You will see a radar icon just above the Discovery button so if you click on that, you will popups for the map view and list view of the group. Finally, there is a chat icon for you to chat with everyone in the group.