With Zenly, you can easily view the address of your friend's current location as well as their distance from you. From there, you can switch to another app to help you reach your friend. For example, you could switch to Google Maps to get subway directions or call a car.
To view your friend's current address, tap on their map pin, followed by the blue right turn arrow icon ↱ in the options bar. Once selected, the Get Directions button will bring up a menu showing the various apps installed on your device that can be used to reach your friend.