I forget the particulars but if I remember correctly there are 2 pools of GPS sats for the us (or maybe it is two ways to get to the same pool. Either way, the standard Samsung way blows while changing the build.prop (I think that is the right where it is) to north-america.pool.ntp.org is more accurate. You can do this with fasterfix very easily, just set it and reboot from within the app and you are good to go.
The particulars are buried somewhere over in the fascinate forum but what I said is essentially right.
PS: it may not necessarily be a corruption, just a sorta bug
2nd edit: The other pool is us.pool.ntp.org I believe (quick and dirty research says so at least)
3rd edit: Playing with fasterfix, I noticed you can set a "custom" pool as well to test them all out.