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No A-GPS location in 3G

Inside my work building I get 3-5 bars now in 3G mode (0-1 previously). However, if I try to get my location in Google Maps I get an error that "Your location could not be determined." If I turn off 3G and get an EDGE connection it works fine. Can anyone explain this?

HP, Windows Vista

Posted on Sep 12, 2008 11:37 AM

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19 replies

Sep 12, 2008 11:56 AM in response to etkal

This is a common complaint. It might work better out side, but it always seems to work on edge.

My speculation: ATT had not set all the exact tower locations on the 3G transmitters, and they all give the phone bogus hints as to where they are.

These hints totally fool the REAL GPS receiver into mis-reporting position.

See, its ATTs fault, not Apples 😉

But outside you would think that after a while it would get a good lock on the satellites and show the blue dot. So try outside for at least 5 minutes.

Either that or the 3G radio swamps the GPS, but they bought those two chip sets from the same company, and you would THINK that the engineers would have known that, because it would fail all the time.

Sep 12, 2008 12:16 PM in response to icebike

I saw this behaviour prior to the 2.1 update as well, but because of the 3G issues I always had that turned off. Now that 3G seems to be working acceptably well this is a bigger problem.

If I go outside then I get the true GPS location, but the issue is when I'm inside with no GPS satellite signal.

I also see the same problem that WiFi SSID trumps tower location (very bad), so when I'm at work and have WiFi enabled it sees one of our work APs but thinks it is located at our old office location (someone must have logged it for them a while back while wardriving). It took me a half hour the first time that happened to figure out how the heck a brand new iPhone would have any idea where I used to work...

Sep 12, 2008 12:29 PM in response to etkal

If I go outside then I get the true GPS location, but the issue is when I'm inside with no GPS satellite signal.


You and eweb101 need to compare notes, because he still insists it does not work, and he's lost in Philly.

On Wifi and Egde, I first get the large circle, maybe 25 mile diameter, then a one mile circle (still wrong) and If I leave it sit there for a LONG time, I get a blue dot. Several minutes, and the blue dot is correct.

Thats when I'm inside.

Outside, if i had location services on all along, the bluedot is almost instant.

Sep 12, 2008 2:57 PM in response to etkal

After posting the previous message, I went to another location and retried to get a fix on my location. In fact I got the fix. However I feel that the error is too big, about half a block. Isn't GPS supposed to work like a GPS? Anything more than 5 meters is a huge error. The Assisted GPS and gsm signals are to improve the GPS accuracy, not to replace it, as it seems to be the case.
I will keep trying.
Best regards
GRCosta

Sep 12, 2008 9:08 PM in response to etkal

The only way I have been able to get the GPS feature within maps to work after the 2.1 update is to have edge AND wifi turned on at the same. Anything different than that combination will not locate me and says "can't find current location". I hope someone can find a fix or Apple releases another update to fix this, because this is a HUGE problem. This feature is suposed to be a main feature of iPhone 3g.

No A-GPS location in 3G

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