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-   -   Nokia N900 A-GPS Not Working Anymore (https://talk.maemo.org/showthread.php?t=90651)

babak 2013-07-05 08:00

Nokia N900 A-GPS Not Working Anymore
 
Hi!
I am in Australia and I found recently that my Nokia N900 GPS is not working, that is, not getting 'locked'. I had this problem 6 months ago but when I changed the server from Nokia to Google (supl.google.com), it started working perfectly. Now the same problem happening again... this time with Google.... Any solution will be very appreciated as I need GPS a lot!
Thanks

pichlo 2013-07-05 08:59

Re: Nokia N900 GPS Not Working Anymore
 
Which application you are trying it in? Nokia Maps times out after 10 minutes, even though locking may take up to 20, so Nokia Maps may never get the lock. Try GpsData, GpsJinni or Modrana.

babak 2013-07-05 09:18

Re: Nokia N900 GPS Not Working Anymore
 
[QUOTE=pichlo;1356991]Which application you are trying it in? Nokia Maps times out after 10 minutes, even though locking may take up to 20, so Nokia Maps may never get the lock. Try GpsData, GpsJinni or Modrana.[/QUOTE

Thanks for your reply. I just installed those applications you mentioned but they didn't work too. I think it has nothing to do with the application that I am running on my phone. Perhaps there is something wrong with the GPS server...

P.S: I'm using Nokia Ovi maps.

peterleinchen 2013-07-05 09:43

Re: Nokia N900 GPS Not Working Anymore
 
Just check once more in settings, that really supl.google.com is chosen!
I have this often reset to nokia.com after a ungraceful shutdown.
If it os set to google check with your data provider that port(s) 7275/7276 are really open.

AliasXZ 2013-07-05 10:09

Re: Nokia N900 GPS Not Working Anymore
 
I have also noticed that it takes an age to see GPS location.

it used to work perfectly up until last week :(

using supl.google.com

it must be an issue with supl.google.com - my s2 also does it

nieldk 2013-07-05 10:45

Re: Nokia N900 GPS Not Working Anymore
 
Do we have the root certificate in place for supl.google.com ?
They used to use Thawte, but now they use Equifax
Perhaps the Equifax Secure Certificate Authority is not installed.
(http://www.geotrust.com/resources/ro...tes/index.html)

peterleinchen 2013-07-05 11:35

Re: Nokia N900 GPS Not Working Anymore
 
Just tested and got sat fix within seconds (Germany).

acrux 2013-07-05 11:38

Re: Nokia N900 GPS Not Working Anymore
 
Quote:

Originally Posted by babak (Post 1356980)
I am in Australia and I found recently that my Nokia N900 GPS is not working, that is, not getting 'locked'.

Actually Nokia N900 GPS does not need any server for getting GPS "lock". These servers (supl.nokia.com etc and the service name is Assisted GPS or AGPS) are only used to accelerate getting the lock. GPS satellites send position signals after every 12.5 minutes, so it takes maximum that time to get a GPS fix in the conditions that there is unobstructed view to the sky. Go to the open landscape an you should get the fix. If not, then... probably hardware failure...

nieldk 2013-07-05 11:46

Re: Nokia N900 GPS Not Working Anymore
 
Quote:

Originally Posted by acrux (Post 1357027)
Actually Nokia N900 GPS does not need any server for getting GPS "lock". These servers (supl.nokia.com etc and the service name is Assisted GPS or AGPS) are only used to accelerate getting the lock. GPS sattelites send position signals after every 12.5 minutes, so it takes maximum that time to get a GPS fix in the conditions that there is unobstructed view to the sky. Go to the open landscape an you should get the fix. If not, then... probably hardware failure...

No GPS with A-GPS needs the A-GPS. But, it will make the lock happen faster.
The mechanism is a bit complicated. Shortly, it downloads 'most recent information' from the area you are located, which it finds using GSM towers and triangulation. A lock will happen really fast, but a precise lock will happen far later, perhaps half an hour, when the GPS have recieved a complete set of data.

http://en.wikipedia.org/wiki/Assisted_GPS

don_falcone 2013-07-05 11:53

Re: Nokia N900 GPS Not Working Anymore
 
Tha's basically what he already said.


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