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The thing is though, GeoIP states they update the IPs every month or so and recommend you to download the .dat file each time and use it because IP addresses change so often.
phpadsnew uses an older version of GeoIP.dat which could cause many ip addresses to get switched around. So, I recommend going to maxmind and downloading the new GeoIP.dat file and placing it where the original file in phpadsnew is so it will use the new database.
Even then, still not 100% sure how accurate it truly is. I would say around 90 or 95% accurate.
that way you don't have to be too concerned about how accurate the geoip database is.