The PDF format should preserve the size of the overlay when you print them. These tools are copyrighted by the artist. However, permission is granted to make and distribute copies on a not for profit basis. These tools were designed using Adobe Illustrator on a Macintosh. The PDF files can be opened and edited in Illustrator running either on a Mac or Windows platform.
Maps come in all different scales.
You may find that you need other scales. To scale an existing map tool to a different scale you should select a tool that is close to the scale you need, and then determine how much to scale it by. Always double check your results against the map to make sure you get the correct results. The equations to do this are more involved than we want to go into here. Most new GPS units will do both coordinate systems.