You might be making a joke, but you also might have something here. If you can get GPS coordinates localized down to 5 meters, then you can have a mobile app that will let you place orders in places like public parks and on the beach. The app would look up vendors in the same location who are currently "open", and present virtual storefronts for them. The app would send the name, the precise GPS coordinates and, at the option of the user, a photograph to aid in finding the customer.

On the vendor side of the app, you'd have a list of orders and a map of the customers. Done properly, this could be a big win for vendors, since ordering would be easier, increased volume would be likely, and they would be better able to plan production/delivery.

Basically, it's like Loopt but for hyper-local b2c. Instead of hooking up singles or friends, you're hooking up cart vendors and their customers.