We haven't seen many changes to Apple's location-based Find My Friends app since it debuted on iOS 5 more than a year ago. Cupertino must have realized it's time for an update; the company just overhauled the feature to include a new UI and more accurate location-based alerts. The app will now let you define the distance from a location for receiving notifications -- so you can get a ping when a friend arrives at the campus library rather than the dorms, for instance. The redesigned app also simplifies the notification process to fit on one page, with options to receive alerts when your friends arrive at or leave a specific place, along with settings for notifying others based on your location. The update is available now for users running iOS 6.1 or later.