I'm more interested in teaching people how to make the best use of their maps, compasses, GPS units, and altimeters. Part of that involves having some simple tools available. I've gotten a number of requests from folks who wanted to buy these tools. So I'm having some of them printed up. Whatever money I make from sales goes into printing new sets of tools.
Bit mapped graphics tend to get scaled in odd ways at the whim of the output device being used.
Most of the time that not a problem, but it just doesn't work with mapping tools. 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.