This looks really great. When the downloadable version with custom imports is ready I could see me using this a lot for maps on the fly, or roughing out an area to map in detail later.

A request to expand its client-base whilst you're developing:

There are a lot of sci-fi gamers too. A blank black sheet as well as a blank white would be useful, especially if it looked black on the screen but printed white to save my ink. The custom imports will allow for the creation of symbols for planets, bases, fleets, ships and vehicles.

Dunno if that's possible, just a suggestion.