I'll post it for you verbatim:
Assisted GPS is fake GPS, using wifi and 3G towers. just like the old first gen iphone... that's not GPS.
Not according to Wikipedia:
Conventional or "Standalone GPS" operation uses radio signals from satellites. In very poor signal conditions, for example in a city, these signals may suffer multipath where signals bounce confusingly off buildings, or be weakened by passing through walls or tree cover. When first turned on in these conditions, some non-assisted GPS navigation device may not be able to work out a position due to the fragmentary signal, rendering them unable to function until a clear signal can be received continuously for up to 40 seconds (the time needed to download the GPS ephemeris.)
An A-GPS system can address these problems in several ways, using an assistance server or other data from a network.
Assistance falls into two categories:
As an additional benefit, in some A-GPS device implementations, the amount of CPU and programming required for a GPS phone is reduced by offloading most of the work onto the assistance server. For modern hardware this is not a major consideration but many 20th century GPS navigation devices used Intel 80386-class 16 MHz CPUs or similar hardware.
- Using information known to the assistance server but not the phone.
- It can supply orbital data and/or almanac for the GPS satellites to the cell phone, enabling the cell phone to lock to the satellites more rapidly in some cases.
- The network can provide atomic time (Accurate Time Assistance)
- The device capturing a snapshot of the GPS signal, with approximate time, for the server to later process into a position.[2]
- Accurate, surveyed coordinates for the cell site towers allow better knowledge of local ionospheric conditions and other errors affecting the GPS signal than the cell phone alone, enabling more precise calculation of position. (See also Wide Area Augmentation System and Cellhunter)
- Calculation of position by the server using information from the phone.
- The assistance server has a good satellite signal, and plentiful computation power, so it can compare fragmentary signals relayed to it by cell phones, with the satellite signal it receives directly, and then inform the cell phone or emergency services of the cell phone's position.
A typical A-GPS-enabled cell phone will use a data connection (Internet or other) to contact the assistance server for A-GPS information. If it also has functioning autonomous or standalone GPS, it may use standard GPS, which is sometimes slower on Time To First Fix, but does not depend on the network, and therefore can work beyond network range and need not pay fees for data traffic.[3] Some A-GPS devices do not have the option of falling back to standalone or autonomous GPS.
All this says is that assisted GPS speeds up contact by using terrestrial networks for fixes when possible. The last sentence is the only thing that may bear on A-GPS devices being "not true GPS".