Develop Bugs

[Q] Anyone have GPS tweak for accuracy?

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..

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.

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?

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!

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.

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..

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

pravarth said:
use this fix: http://forum.xda-developers.com/showthread.php?t=953630
Maybe it helps
Click to expand...
Click to collapse
Already tried.. even tested various value in gps.conf. No good..
Thanks.

bobo9900 said:
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..
Click to expand...
Click to collapse
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

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.

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?

[Q] Strange Arc S signal / battery drainage problem

I bought myself Arc S, it came loaded with .62 firmware. On my initial run, battery ran for about a day, later on for two or maybe even three days. Then I started to work in another country. As far as I remember, battery life was the same, even though the network was not (where I work now is 2G only, in my home country 3G). Then one day messed around with a Xperia S apps, did a stupid mistake and started to get force closes with launcher. I had to repair software.
Since the software reinstallation, my battery life degraded to less than a day without even touching it. Therefore I installed Battery Monitor Widget, to see, what is going on. I noticed, that battery drainage is about 70-110 ma in average, as far as I know, it should be much lower (under 30ma?). I have to say, that I tested this with .62, .42 firmware and it's all the same. When I turn phone to airplane mode, energy consumption lowers to under 5ma - which is normal i guess.
It began to bug me even more, as we bought small alarm clock with radio. I noticed, that when this alarm clock is on, despite from 2 other phones our room, my Arc S is the only phone, which makes this kind of searching-for-signal or calling speaker interference (noise coming out of speaker). My phone does that all the time, even in idle mode. This can be also heard when we have our TV on on. So, if I don't want to hear that, I have to unplug the alarm clock or put my phone into airplane, which sucks.
I asked a guy next building, if he has the same problems with Arc S, and he says that his phone can live up to 5 days with one charge (is connected to the same network provider), so I guess it is not network related?
I wonder, is there a possibility, my phone's radio is broken somehow? Or it was faulty, and firmware reinstall somehow broke it to the end? So that is draining battery all the time - looking for signal? Any way to fix this? Flashing different base bands did not help, tried that already...anybody knows a fix for this, apart from returning it to my provider - since I'm 4 months away from my country
Anybody heard for any similar problem with Arc S?
Thanks in advance! (if needed, I can also post battery usage screenshot, but I think it's not much of a help)

lyteo said:
Then I started to work in another country. As far as I remember, battery life was the same, even though the network was not (where I work now is 2G only, in my home country 3G)
Click to expand...
Click to collapse
That seems like the issue here if I'm understanding you correctly. If you don't have 3G service where you currently are, and you did not turn off 3G, your phone will constantly try and find a 3G signal.
Airplane mode fixing the issue makes this seem even more likely. Try disabling 3G and see if it helps.

Problem is, that's what I did almost instantly when I came here, I set it to GSM only. One thing I noticed right now, when I check into About phone, under Mobile network type, my Arc S has: UNKNOWN, where my friends HTC says EDGE. Maybe here lies a problem? Why my phone can't detect network type?

Incredibly, I found the reason for my drainage and signal search. When I came into that country where I work now, my provider offered me to turn off data transfer (provider turns it off for me). Of course I did not want any unintended data transfer, so I turned it off by sending sms to service number. After I reinstalled software (that was my first reboot here), phone couldn't find network type for that reason, and was searching for it all the time. Yesterday I allowed data transfer by sms again, phone found EDGE network, can't hear any more noise on our alarm clock and battery drainage is about 4% per 8,5 hour. Excellent
I hope this helps anyone out there with drainage problems.

I think you can also turn off/disable data transfer/traffic with the Data traffic widget, if you want to avoid using data.

xperia arc s
hold up, i dont understand. so im pretty sure i have the same problem. get about 17 hours with berely using my phone on any rom/kernal/firmware. even with data turned off, betterbatterystats shows 'noor unknown signal' and 'no data conection'? i sued to able to get 3 or more days out of my phone??

I think there is an application, which might be keeping the phone alive.

dout it, still drains after a complete rom wipe

Speed up GPS sync?

Hello
I'd like to get started contributing to OpenStreetMap using my Galaxy Nexus running the stock 4.2.1 (JOP40D.I9250XWMA2).
I keep the GPS feature disabled because it drains the battery, but it can take several minutes to sync up while in the city before I can take a picture and have it tagged with the location
What could I try to speed things up? Connect an external (A)GPS chip through the USB port? Move to CyanogenMod?
Thank you.

FreyrNjord said:
Hello
I'd like to get started contributing to OpenStreetMap using my Galaxy Nexus running the stock 4.2.1 (JOP40D.I9250XWMA2).
I keep the GPS feature disabled because it drains the battery, but it can take several minutes to sync up while in the city before I can take a picture and have it tagged with the location
What could I try to speed things up? Connect an external (A)GPS chip through the USB port? Move to CyanogenMod?
Thank you.
Click to expand...
Click to collapse
I think move to a custom rom cant speed up your gps.
But an external GPS can help you.

At least part of the problem is that you keep the GPS off normally. So every time you turn it on, it has to obtain a cold start, which takes a lot longer than a hot start. Leave the GPS on and it should obtain a fix much faster.

Leaving the GPS toggled on in Android does not mean it's being utilized. If it's not being utilized, it's not draining battery. If it's being utilized, you should see the GPS icon in your notification bar.
It's been a long standing myth that leaving it toggled off magically saves battery. If leaving it toggled on is draining your battery when you're not using it, you have a rogue app that is using the GPS.

if you have root you can try fasterfix from the play store to get a faster GPS fix

Maestrodude said:
if you have root you can try fasterfix from the play store to get a faster GPS fix
Click to expand...
Click to collapse
Thanks for the tip. I moved from stock Android to Cyanogenmod over the week-end, and will give Fasterfix a shot.
BTW, recently, while still using Android 4.2.1 and travelling to a neighboring European country, even after connecting to a local wifi hotspot and using GPS Status' Reset + Download features, I noticed two issues:
GPS didn't lock for hours even while being outside the whole time
When it did lock, it didn't keep track and was stuck where it was
As a result, GPS was pretty much useless.
What could be the cause for this? Aren't AGPS data supposed to let me lock faster? Will Fasterfix solve the issue?
Thank you.

[Q] random reboot while using GPS for longer time

Can anyone confirm random phone reboots while using GPS for long time? I experience it regulary. After and hour and half or two hours of using GPS (either in car for navigation, charging/not charging) or on bike for tracking (screen off) with endomondo).
I'm going slightly mad because of this. I thought initially that the phone gets overheated with charger, but it reboots even with screen off, not charging). My other guess was the navigation application, but it happens also with sports trackers (endomondo, strava). So definitely it must be a problem of GPS driver or hardware. I tried various ROMs, CM10 or .211 or .96 ports, but it happens all the time.
Does anyone have more info or in the best case a solution for this? Thanks a lot!

I gave it some more thoughts. I use GPS Status with permanent notification with status details constantly being updated. I uninstalled it today, maybe this was the issue. Please, can anyone confirm that GPS Status is the cause of problems or that GPS Status is working fine even for few hours of gps activity? Thanks

same problem
Hi,
i have two xperia ion with the same problem. When i use GPS for tracking on my bicycle with locusmaps or oruxmaps it alway reboots after a while, it works maybe 30 minutes or one hour but then it reboots. The same with Navigon navigation, always reboot after about 30 minutes. Both smartphones the same problem. Running on Android 4.1.2, i downgraded the phone to ics 4.0.4 but the problem was still the same.
Did you solve that problem??
Thanks
Peter

solution:
https://talk.sonymobile.com/t5/Xperia-Ion/sony-xperia-ion-restarts-when-the-gps/td-p/999892/page/5

[Q] LG G4 GPS problems

I have H815 Eu. Everithing is OK (almost fantastic camera!). But the GPS....is necessary more that 1 minute to connect with the satellites and for that reason it is useless on the road. I have too a Sony Xperia Z1, and with this I haven't any problem: satellites in 3-4 seconds!. On my car I have this Z1 and I driven thousands kilometers without any problem.
More, G4 with GPS connected became very hot after ten minutes. What to do?
Locked LG G4, H815 Eu with iGo8.

My G4 connects and locks the satellites very quickly...1-5 secs. But when using Endomondo, ie. when running, it loses connection several times and I have to turn the screen to the sky for it to connect again... :/
Don't know yet if it's the G4 or the app that's faulty...
W.Z.

wernerzero said:
My G4 connects and locks the satellites very quickly...1-5 secs. But when using Endomondo, ie. when running, it loses connection several times and I have to turn the screen to the sky for it to connect again... :/
Don't know yet if it's the G4 or the app that's faulty...
W.Z.
Click to expand...
Click to collapse
Since Ive rooted I am having more or less GPS problems...Have to turn it on and off and apps like Uber or even maps struggle to find the signal. Before root it was instant...

My lg g4 is bone stock, it does have a GPS issue, it will hear up the phone and you pocket and it will quickly drain the battery. Love the phone, however toggling location on and off sucks.
It will do it with no apps running, however with Rivet app using the radio it will constantly bang the GPS until the phone is hot and the battery drained.
Anyone try factory reset? Did it core or lessen the issue?

It seems that you are experiencing the same problem as described here
http://forum.xda-developers.com/g4/help/android-drains-battery-t3179800
Probably a Problem with Google play services...