Offline maps for travelling

My windows phone has an app called Here Maps from Nokia. This is now available on Windows 8.1 and has an offline option allowing you to download any country's map in the world.  I still use the TomTom for in car navigation while travelling but this is a good backup and maybe handy if you are walking the back streets of Rome and you have the tablet in the backpack. It is a freebie app from the windows store. For subsequent map downloads you need to search for the location first and add it to a collection then a button allows for downloading.