On the VIP website, once inside, look for a botton called "TF201 GPS Extension Kit Apply&Inquire". After the click you will see something like this:
"Thank you for purchasing the ASUS Eee Transformer Prime TF201, and helping to make it the most popular Android based tablet since its launch in December 2011. We greatly appreciate feedback from our valued customers about our products, and take it very seriously. The response to the TF201 generally has been overwhelmingly positive, but we understand that, in certain regions, the GPS functionality has not met some user’s expectations.
Free Dongle! At ASUS, we are committed to delivering innovative, high-quality products and services, and our customers’ experience is important to us. Although the TF201 is not a professional GPS device, as part of our unwavering commitment to our customers we are offering all customers who purchased a TF201 system a free external GPS extension kit, called a dongle, which may help improve signal reception and optimize the user experience. We are pleased to announce this offer as part of our commitment to customer service, but it does not replace, alter or amend any existing warranties you may have.We also encourage you to contact ASUS customer support in your local region directly if you are experiencing GPS related problems.
ASUS prides itself on delivering an unrivalled user experience, and we offer our sincere apologies for any inconvenience that our customers may have encountered.
The offer will expire on 31th of July, 2012 (PST)."
It doesn't matter if you bought it in the USA and you live in Europe, just drop your adress and they will send you the hardware free of charge.