[Q] A-GPS in maniac's CM7

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I start this thread as I would like to find out how it works and why I have a problem with it.
A-GPS in maniac's built CM7 nightly 20120616 seemed to me a great feature in case we have no data connection and need GPS.
It downloads lto.dat file to /data/location/

All other files, like gpsdata.nvs for ephemeries, LEARN_STORE.bin for last fixes, location.cfg are updated after each use of the GPS.

What I checked earlier with CM 7.2 official, with no data connection, it took ca 3 minutes for the fix (and it does not use lto.dat file)
With data connection for both builds it is only ca 10 s to fix.

But with no data connection and after downloading lto.dat file my defy with CM7 nightly 20120616 cannot fix at all - it shows up to 2 sattelites in the center of the radar, with almost the same position.

So my question would be: if there is no data connection is the device somehow forced to use lto.dat? Could be that lto.dat file somehow 'fools' the device for any reason?

You probably didn't initialize the lto.dat.
You have to do a fix after every lto-Download and after every reboot in order to initialize the lto.dat.

What i want to say is: The lto.dat doesn't work and also isn't used for the first fix after download or reboot.
You can do a fix with A-GPS (DATA ON) to speed up the process. After that, the lto.dat will be used in offline mode.

I don't know why you can't get an offline-fix after downloading as the lto-file isn't being used then. Could be coincidence.
It works for me in about 30 seconds although it is true that GPS Status shows the first 2-3 satellites in the middle with the same positions.

If you download the 30-day file and initialize it before leaving your country it should easily last for a vacation.

It works perfectly for me. After initializing an offline-fix usually takes about ten seconds...

Greetz, Unr3aL67

Sent from my Defy via Tapatalk

GPS is only reason I left cyanogen. I use car navigation often, in roaming too, and I run into BIG problems. Miui has maybe even bigger problems.

Interesting in every stock and derative ROMs GPS run perfect. Everything is is seconds, with or without data. And GPS status program find more satellites.

I would really love someone deal with this problem seriously. But I think, untill Quarx need GPS badly, this problem will not be solved completely

Questions go in the Q&A section

Thanks a lot for some explanation. Problem is now solved and in my case it turned out that the main cause was use of GPSEssentilas to check how fast I can get a fix.
And after each start of the apk it stopped working and I had to start it second time but with no success in fixing the position (I was wiping its data, reinstalling, but nothing helped).
And when I forced it to close and checked with any other map apk I use, I get a fix quite fast.

I wouldn't say that stock ROMs find more sattelites, I usually have 6 - 8 in less then 30s, no matter now with or without data transfer on - the fact is that my MTK Qstarz module have cold start up to 1min 30s without any data preloaded, but it is a better chip than defy's Broadcom and what I observed its max sattelites found was 9.

And when driving I usually use a car navigation, but in many daily cases like looking for sg during a walk or trying to meet friends phone gps is a must ;)

Check this link for automatic lto.dat download:
http://forum.xda-developers.com/show...7&postcount=54

It works well with froyo.
In cm7/9/10, insert the code to a right file.