I am brand new to this, and would like to ask what will probably be a very stupid question. A lot of the maps I see posted here are of particular regions or continents. This is understandable and practical. However, being the anal retentive person I am, I am always left wondering... 'but what's just north of that?'

I would like to create a full world map, and then "zoom in" to do maps of each individual continent (or even regions of each continent). Is there any way to do this using photoshop, while maintaining an accurate scale, without having to redraw each individual continent or region?