Use my mapper2.pl tool which will put crosses on the corners of your images and their in-game /loc values (Upper Left x/y, Lower Right x/y). Pull the bitmap x/y values off your final image. Then use Taco's zonerect calculator tool. After you calculate the zone-rect, hide the crosses. I typically get it right the first time, every time.
If you have someone with you in the zone, in your group, and you /quit out, it should let you back in to the same zone. That's how I was able to do DFC without waiting several weeks.
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