Not quite what I meant by assisted GPS though there are two different technologies that I've heard referred to in this manner. One is that which you mentioned, but its also possible for quite a few GPS units to download the ephemeris data from the internet, in order to speed up the satellite fix. IE, it'd make it akin to a hot start every time you connect, giving a fix in the order of a few seconds, rather than the 30-60 seconds it generally takes for a cold start. Also, this would help because the satellite data that you download means that you wouldn't have to have great signal in order to get that fix, if you've got a weaker signal it will still be able to lock on. (The ephemeris data downloading via satellite requires you to have I believe 5 satellites available, and after its downloaded I think you can work with 3, or something along those lines.)