Nearest Contacts geotags your contacts, and then shows them to you, arranged by how close they are—as a list or on a map.
What’s it good for? On the road, it’s a quick reminder of which of your friends, family, or colleagues are nearby.
If you’re calling on a customer, use Nearest Contacts to find other customers that are nearby.
Nearest Contacts really shines when you use your Contacts app to record your favorite restaurants, hotels, and other points of interest. If you’re like us, this kind of information, if it gets recorded at all, tends to be randomly distributed across notes, calendars and what-not. But your iPhone’s address book works great for this, with addresses, phone numbers, URLs, and your own notes.
So use Contacts to remember your favorite sites, and Nearest Contacts to help you find them when you're in the area.