Tesco launches shopping trolley sat nav

"When a customer enters a Tesco store, the app will create a store map with all of the items on the shopping list laid out on it. After pressing the start button, the app will then find the shortest distance between the products and the shopper, and create a route for the trolley to follow. Other items can be added to list at any time and located within the shop. "

http://www.telegraph.co.uk/technology/news/8535252/Tesco-launches-shopping-trolley-sat-nav.html