Samsung USA tweeted on Friday that the US line of Galaxy S phones should receive an update for the GPS in September. Some handset of the US variants of the Galaxy S line were having problems with the accuracy of the GPS receiver in their phones. A manual GPS fix exists for users, and you can see how to do it here.
Engadget writes that the problem stems from "a bunk positioning server being used to associate towers to geographical locations. In practical terms, that's made apps like Google Maps nearly useless indoors and in urban canyons where line of sight to the birds up in orbit is dicey or impossible"
Phandroid notes that "the Samsung Vibrant and Samsung Captivate seem to be the two handsets affected the most by poor GPS functionality, though there is a good chance the unreleased Epic 4G and Fascinate Galaxy S phones could suffer from the issues as well."
Engadget also mentioned that European users have been complaining of GPS problems as well, but I haven't seen that here in our forums, or anywhere for that matter. My Samsung Galaxy S doesn't suffer from those problems, likely because European Galaxy S handsets use a different server.
Image from Engadget