As promised, I wrote this up during hour 4837 of my red-eye to Glasgow last night, and I have posted it on my blog. If it's got any glaring errors, let me know. I haven't found another step-by-step guide like this. [URL]http://cynicor.blogspot.com/2006/07/how-to-make-gps-device-for-nikon-d200_28.html[/URL]