I thought some may find this interesting.
I have a lot of time to kill traveling for my job so I searched for an iPhone app I could draw the caves I am working on.
I realize that accuracy is an issue but it's good for just myself.
This app, Sketch Pad, has grid lines that turn on and off and unlimited paper so your cave can fit.
Images
http://img.photobucket.com/albums/v83/b ... 63df0d.jpg
http://img.photobucket.com/albums/v83/b ... d5005f.jpg
http://img.photobucket.com/albums/v83/b ... aa7377.jpg
Okay, good day-
Max.