Best way for GPS to get a fix is park somewhere nice and open (no tall buildings etc) and leave the sat-nav running without moving the car. As soon as you drive off it increases the time to get a fix by a country mile. Shouldn't take more than a few minutes.
The sat-nav will look for where it expect the satellites to be, but if that was more than a couple of days ago it'll be looking in the wrong place. Eventually it figures it out and then knows where to look the next time.
On my TomTom you get a weekly download telling it where to look for the satellites on a given date.
|