"I knew I was going to need a lot more than that, but
loading even FOSS software on the company computers is strictly
forbidden! I took one of my old laptops (a Micron Trek2, PII 300
with 192Mb ram, 20G hard drive), loaded with Debian Etch, and kept
it in my desk drawer for whenever I had some time to work on the
map. I used Inkscape, because It's easy to use, yet powerful enough
to do everything I needed it to do.
"As my work on the map progressed, I converted the .svg drawings
to .png, (Windows doesn't natively support .svg, not on our
network, anyway) and printed them out for everyone else to edit and
add information to, which I then used in the next version. It took
about 6 months, but I finally finished it, then converted the final
version to a .pdf which I took to Kinko's for printing."