What I did was take the existing TX WARN from the global database that Uniden made from the RR database and I did change the way the sites are done. The way they have it set up you either have to input your location or use GPS or set some sites to avoid so the scanner does not waste a lot of time searching every known frequency of every known site for active control channels. What I did instead was to make a list of all the active control channels shown in red and the alternate control channels shown in blue in the RR database and I used only the sites in the counties that I will be working in or have to travel to which is about a dozen or so counties. I deleted all the sites that Uniden had programmed and using the control channel info I spoke of above I was able get it down to only four sites with the max allowed 28 control channel and alternate frequencies in each. Now, one other issue. If you don't set a system delay time then the scanner will keep trying to cycle through all sites looking for control channels and this wastes time and cuts off the beginning of some transmissions. So all I had to do was set the longest delay time allowed, 255 seconds, so the scanner will park itself on one good control channel and stay there and only cycle through the others evey 255 seconds (4 minutes 15 seconds). With the way I have it set up it will cycle quickly through the other three sites I programmed and not find an active control channel and come back to its good active control channel that it was using. THis make the minimum possible missed beginnings of transmission or missed transmissions from having to cycle through multiple sites. This method works good on the road. When I get too far from the site the scanner has been using it drops that control channel and finds another one and stays on that one until it checks the others every 4 min and 15 sec. This method keeps me free from having to use GPS and from having to enter a zip code. If you use the GPS or Zip code method there is another drawback. If want to make the scanner only check close sites for active control channels and set your range for say 10 or 15 miles or so then it will also only monitor those agencies which are within 10 or 15 miles if there is a location set for them. I want to hear ALL active law enf, fire and EMS talkgroups on the site the scanner is using no matter how far away they are. That way I know what is going on ahead of me on the highway. I like my method much better but YMMV. Some people like the GPS better. To each his own. My method leave the scanner free from being bound to a peripheral device so I hop in and out of the car with it in my pocket and take it into the hotel or other buildings without having a GPS dangling from it.