hi Friends.I have some problem with GPS in 5800 Xm Navigation Edition.It takes more time to load the map.and some times the satlite signals are not availabele even when i stand in a open area.if once i get the GPS reception Next time in the same place im not able to get it.what is the problem with it.how to clear all the gps memory and start it once again?Is there any specific idea behind the speeding up the GPS and to get the effective GPS reception.??pls help me..