ASUS has issued an official statement on the matter and determined that the Prime's GPS is functioning as intended, which for many folks means essentially non-functional.
"Please note that this product is not a professional GPS device ... To avoid inconveniencing users who demand a powerful GPS device, we made the decision to remove it from our specification sheet and marketing communications. We apologize for any inconvenience this has caused.
ASUS"
Comunicado de Asus Taiwan en Facebook
http://www.androidpolice.com/2012/01...ftware-update