Originally Posted by
fishingmaniac
My iPhone 3G did not get a fix even when held up against the window for 30 sec. My guess is that maybe the algorithm couldn't do the math calculations fast enough to keep up with the high rate of travel, or the multiple layered window and frame obstructed the view too much.
It most likely isn't that complicated - you just didn't have it there for long enough. Unless you are physically very close to where you last used the GPS feature it could easily take 5min or more to get a fix, as it does not have the mobile network to assist it with a "hint" of where you are.
Should be no issue due to speed or the a/c windows, have had this working on many GPS devices over the years.