just in case i wasn't alone though, here's how to start where you want as Thursday suggested.

it's basic, and embarassing that it took a couple days to sink in. when you watch the gridcosm online you will see an address in the "browser window."

that's what you need to navigate offline as well. so, offline just add "?TOPLEVEL=&STARTLEVEL=" to the line in the browser window, and of course add the number of the level you wish to start at.

mmmmmmm tasty gridcosm !