I had the same. Tried several modems etc.
Flashed to dark knight and used gpsaids.
Then the problem was gone and flashed back to slim. Now all works well. Too bad I was so pissed off, I did couple of things at a time and can't really say what fixed the problem. Last weekend I drove over 600km without losing fix.
Sent from my GT-I9000 using Tapatalk 2
Use root explorer and go to /system/etc/gps.conf
In the first line you will see the NTP server. In Slim it is by default set to world.pool.ntp.org
To get maximum GPS performance you must change it to the most appropriate server for your region. For example, here in Greece we change it to europe.pool.ntp.org
After you succesfully change it (remember to select mount R/O instead of mount R/W in root explorer before you edit gps.conf file) save and exit. Reboot your phone and use some app to clear your previously downloaded gps aiding data (for example "gps test" by a dev named Mike Lockwood, check it on Play Store).
Get out of your house, in the open sky, enable 3G data and GPS and start searching for satellites. New aiding data will be downloaded and your GPS will lock quicker than before.
I have already done this all and even more. This does definitely not help! I noticed that sometimes this improved the TTFF, but the phone looses the fix immediately and does not get it back. My guess is, that the problem is caused by unstable values from the other sensors like compass and accelerometer.
I was out under clear sky for more than an hour without getting a fix, btw.
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