\" \" An app based on three-word addresses is making mapping and GPS more precise than we ever thought possible. That means your front door and back door could theoretically have individual three-word addresses. AdvertisementAdvertisementYou're probably wondering what possible advantage this might have over good old latitude and longitude, and those 123 Maple Drive-style postal addresses. And it does, because so much of the globe doesn't have postal addresses or is completely off the grid. What3Words has an online map where you can determine the three-word combos for your favorite haunts — or any other locations.