Clever apps, especially ones related to traveling, are invariably in demand. When in an unfamiliar place, you won’t lose your way as long as there’s a maps solution at hand. There’s a variety of these tools on the market, but few are worthwhile. The one called Maps Frontier might appear to be a lure but it’s a questionably good pick, because it’s got a side effect – annoying ads popping up in web browsers on Mac. Here’s what you need to know about this crafty impostor.