I print my own maps on not to thick printer paper. Then i use a mix of white glue(to glue wood) and mix it with water and a drop of dishcleaner soap(to get the tension of of the water).
Soak your map until completely whet and drape the map on the surface you are using.
It will stick to your surface and after drying it is as yoy want. The glue will dry invisible.
Hope you can use this.
Greetz,
René