Still not having luck with your Vibrant’s GPS signal?  Don’t worry then, you should know that you aren’t the only one.  Samsung has said that they are working on a fix, but maybe there is a solution that you can try right now.  You can try enabling the use of wireless networks (Settings>Location & Security).  This should improve your GPS signal when you are in areas with poor GPS signal strength, which is always where you actually need GPS.  Now, this fix won’t solve this issue entirely, but it should help until Samsung’s GPS fix is finalized (which they need to do since all the Samsung Galaxy S phone’s seem to have the same GPS issue).  Let us know how it works in the comments!

Engadget