I love reading about all those amazing digital solutions, but I reckon that for a more analogue approach, basically the only way is to either make the entire dungeon on a (one inch) 2,5 cm square scale, or to make a big version of an area (the battlemat) complemented by a smaller sized, let's say 1 cm (2/5 of an inch), version for dungeon-exploration.

Are there a lot of people with the entire dungeon on a scale which allows 1 inch squares?