The following sentence in bold:
The Wi-Fi TouchPad does not have built-in GPS; it gets its location using Google Location Services. Google Location Services works by calculating your position from the known GPS location of a Wi-Fi network’s IP address, and in our testing it was almost always able to get our location within a block. Needless to say, you’re not going to want to wait for the cellular version of the TouchPad if you’re wanting to use it for actual navigation.
I take it to mean "Don't buy the TP if you're wanting to use it for navigation", which can be boiled down to "GPS still doesn't work great in WebOS devices".