[Q] Anyone have GPS tweak for accuracy?

[bobo9900]

Is there anyone who use defy GPS daily? Can you share which rom or any GPS tweak to make defy more accurate and responsive for navigation?

I have been testing defy GPS, it seems like its rather not accurate to pinpoint location. Accuracy show 4-9m, but often real position is off by 30-200m. For navigation, it's response time rather slow plus the inaccuracy makes it not reliable. My old windows mobile P3600 gives precise position when put beside defy while navigating.
For info, I have disable wifi in location setting. I know I have successfully download supl data. With data enabled, I can lock under 10 sec.

This inaccuracy had been a problem for CM7. I have tested stock froyo and gingerbread, and problem still there.

So, can anyone help here? Do you have the same problem, if not please share your rom version or tweak..

 

[Mikis89]

I've used mine a lot for gps, i just make sure to download agps data with an app called GPS test as soon as i can, then if i'm not moving too much from where i stopped gps for the last time it takes very little to lock.

I'm on CM7 and it never disappointed me in Italy, Germany, Netherlands, Belgium and France.

Any GPS fix i've tried did nothing good for me.

 

[bobo9900]

My defy lock fast. What bothers me is the accuracy.
Google maps shows accuracy 4-9m, but real position is off sometimes by 200m.
Sometimes it correct itself, other time, even if I waited for a few minutes, it didn't show my real position.
And I'm sure I disable Use Wireless Networks in location setting.

So how is your accuracy?

 

[Mikis89]

Relly good, thanks

Seriously, i've seen this mentioned quite often in the CM7 thread, but it never happened to me.
As said before, keeping agps data pretty updated to my position or close enough has always been enough for me.

Good luck in finding a solution that works for you!

 

[Zephyrot]

GPS has been working perfectly for me under any Rom. Stock GB, CM7 and Stock Froyo.

In CM7 it locks pretty fast, always under 10 secs, after a few secs accuracy down to 3m. Works really good.

I only have GPS Status to download from time to time accurate AGPS data and that's all.

 

[bobo9900]

Thanks for the reply..

I have tried almost everything.
Tuning gpsconfig.xml and location.cfg, clear agps cache, restart before testing many value one by one. Tried many stock rom, take GPS files from milestone and milestone2 and the GPS still inconsistent.
Sometimes its accurate, but after turn off GPS for a few second, turn on again, its showing wrong position with accuracy shown as 4-9m, waited for some minutes, and still wrong. Sometimes its accurate for a few test, but after a few minutes, turn on GPS again, its showing wrong position again.
Tried also calibrate compass, even remove the compass driver, but still error.
There is a possibility of multipath error in GPS (bouncing signal from surrounding), but with easily lock to 5-6 satellites with 10-12 satellites in view, I suppose this can nullify error, as real for positioning, we only needed 4 satellites.

I hope there is someone out there know fix for this..

 

[pravarth]

use this fix: http://forum.xda-developers.com/showthread.php?t=953630

Maybe it helps

 

[bobo9900]

use this fix: http://forum.xda-developers.com/showthread.php?t=953630

Maybe it helps

Already tried.. even tested various value in gps.conf. No good..
Thanks.

 

[King_Rat]

Is there anyone who use defy GPS daily? Can you share which rom or any GPS tweak to make defy more accurate and responsive for navigation?

I have been testing defy GPS, it seems like its rather not accurate to pinpoint location. Accuracy show 4-9m, but often real position is off by 30-200m. For navigation, it's response time rather slow plus the inaccuracy makes it not reliable. My old windows mobile P3600 gives precise position when put beside defy while navigating.
For info, I have disable wifi in location setting. I know I have successfully download supl data. With data enabled, I can lock under 10 sec.

This inaccuracy had been a problem for CM7. I have tested stock froyo and gingerbread, and problem still there.

So, can anyone help here? Do you have the same problem, if not please share your rom version or tweak..

MIUI rom allows you to enter your preferred satellite under ph settings ^^

Then use gps status app to manage a-gps state - I get anywhere from 10 - 30m accuracy

 

[coolwaves]

You are not alone

GPS accuracy on my Defy has been a concern since I bought it. Just like yours, it locks to 4-6 satellites and claims that it's accurate to 4 meters, but my real position is usually a block away. Other symthoms are:

- Accuracy improves with speed and becomes very good when traveling by car, very poor when still or just walking. The correlation between accuracy and speed should be the other way around...

- If there are more than 6 satellites in view, it locks to a maximum of six and then starts "jumping" from one set of satellites to another each two seconds or so. It does so even if the telephone is completely still. I think It should stay with the same satellites while not moving.

As you, I also tried all and every GPS fix script under the sun to no good, even filled a bug report for CM7 back in the day with no luck. It seems that a lot of people out there have perfectly working GPS (o so it seems).

This issue is quite strange though. I have a green lens Defy, and my wife has a Red lens one. We bought them several months apart and they both have the same accuracy issue, so it doesn't seem to be related to a bad production batch. I wonder if its related to geographic position (maybe it works worse in some countries, somehow)

Hopefully its a software issue and can be fixed.

 

[Ptikjp]

I dont have this issue. Ive actually been sort of surprised at the accuracy of the GPS with CM7... it locks on within seconds (vs the minutes with Froyo). Almost instantaneous with WIFI and GPS on. And it is always accurate. Sorry to hear about your GPS troubles. It could be a hardware problem also?