New map type that auto swaps to current location map

A new type of map that does not have its own content, but instead shows you the content of the existing regular map (of the same zoom level) for whatever your current location is. It shows nothing if you do not have an existing map for your current location. As you explore the source map is updated as if you were holding it. This way you can have a map-wall at home and navigate known territory without needing to carry copies of all your maps!

This new type of map could be made via a new enchantment or perhaps using an eye of Ender.