pv wrote:
> I don't have anywhere near as fast response with my Magellan Roadmate 500!
> Many times I've plugged in the Magellan, put our luggage in the rental car,
> and been out on the highway for five minutes before it locates us. Not
> great if you're not familiar with the area!

With my Garmin GPS V, how long it takes to sync up with the satellites
depends on how long it's been off, and where. If it's been off for
several months, it takes a couple of minutes to sort things out. Or if
it has moved a couple of hundred miles down the road since it was last
powered up. If it was on recently and in the same location, it syncs up
in 30 seconds or so.

The point of aGPS is that the cell site sends the phone, in a couple of
seconds, all of the info it needs to do a location fix, and it only
needs to pick up relatively few bytes from the satellites to get the
fix. Also, aGPS can also use triangulation with the cell sites along
with the GPS fix, particularly if it cannot "see" enough satellites.
These were requirements for E911, but come in real useful for
applications like VZ-Nav.