What is A-GPS and how to disable it

The Nokia 5800 comes with an integrated GPS and A-GPS receiver. While GPS only uses satellites for positioning, A-GPS (Assisted GPS) uses the cellular network. This is specially handy in cities, where buildings usually block the satellite signal. This makes A-GPS faster and more accurate than simple GPS. The downside is that A-GPS requires Internet connection through the cellular network so it costs money. You can't access to A-GPS through Wi-Fi either.

You can disable "Assisted GPS" in "Applications" -> "Location" -> "Positioning" -> "Positioning methods".

Now, getting "My position" will take between 30 seconds and 5 minutes instead of only a few seconds. But an Internet connection is not needed!