Let's face it: large physical retail stores can be difficult to navigate at times, especially for first-time shoppers. To help alleviate this problem, UK retailer Tesco (informally known as the European Walmart) has developed and is now testing an in-store GPS system that can be accessed from an Android phone.

Upon opening the app, you'll be greeted with an empty shopping list which you can fill with any and all products available at Tesco. This isn't just any shopping list, however; step into the Tesco Extra store in northeast London and a comprehensive store map will appear on your handset, complete with the locations of all the items on your list.

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