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I have the PD 782, I have been programming the NC-PRN and the South Carolina channels and TGs into it. I am currently using the zones, programming 2 towers per zone. It is my understanding that their is only 64 zones in the radio. At this rate I will be full when I get 128 towers in the radio. I looked at razorseal's youtube which was very informative. It gave me new information on the roam feature. But I keep wondering what to do when I fill up all the zones. I feel like there is something simple that I am missing. Thanks to all.