bct15 gps coordinates

I'm a bit confused with GPS settings on my scanner. In the database, I can see that someone has been nice enough to calculate a location point in the center of each municipality, and a range value that covers, more or less, the geographic area of the town. The range values will be something like...

I am working on getting all the sites for the StarNet system in Houston in to my scanner. I have finally figured out how to get the correct format in to the scanner (through the keypad) and it works perfectly! So I input all the data (24 sites) then read the scanner in to UASD (for a backup)...