Losing GPS signal while navigating - Samsung Galaxy Nexus

Hi,
I have a strange issue with my Gnex.
I used to run CM11 nightlies on my device, but I noticed that the device loses GPS signal while navigating (using Waze for example) and then it takes like 3-4 more minutes (if at all) to recover the signal.
So to test it, I flashed stock back (rom, recovery, kernel).
but I still have this issue. I cannot navigate 5 minutes straight without losing the GPS signal.
I tried to run GPSFix, but it didn't really help.
Any idea/suggestions what can I do?
thanks guys!

TopTomy said:
Hi,
I have a strange issue with my Gnex.
I used to run CM11 nightlies on my device, but I noticed that the device loses GPS signal while navigating (using Waze for example) and then it takes like 3-4 more minutes (if at all) to recover the signal.
So to test it, I flashed stock back (rom, recovery, kernel).
but I still have this issue. I cannot navigate 5 minutes straight without losing the GPS signal.
I tried to run GPSFix, but it didn't really help.
Any idea/suggestions what can I do?
thanks guys!
Click to expand...
Click to collapse
Is your device activated on a cell network? Gnex by default has assisted gps, so it needs a data connection to establish a fix. What you describe could happen as you leave Wi-Fi, have no signal, and it takes 3-4 minutes to grab the gps ephemeris data from satellites. Just a guess.
If this isn't your problem, have you tried using GPS status and toolbox app to Resetand redownload agps data?

klobkelosh said:
Is your device activated on a cell network? Gnex by default has assisted gps, so it needs a data connection to establish a fix. What you describe could happen as you leave Wi-Fi, have no signal, and it takes 3-4 minutes to grab the gps ephemeris data from satellites. Just a guess.
If this isn't your problem, have you tried using GPS status and toolbox app to Resetand redownload agps data?
Click to expand...
Click to collapse
Hey, thx for the reply.
Yes, I have a 3G connection and WIFI turned off.
I tried the toolbox, used it to reset data etc - but it didn't help

Well, the only way to truly know would be to flash a stock image and see if that works. If it doesn't, then you have a hardware problem.

Give GPS Test a go (search on Play store, I can't put external links here, it's the one from Chartcross Limited). It helped me a lot some time ago when I had your same problem.

Related

[Q] No GPS Sat fix without Data Connection (aGPS)

Hi there,
first: sorry for the 1.000.000th thread about the GPS sat fix on the DEFY, but I have tried several ROMs now and still have not found the solution for my problem.
The problem is: my DEFY does not get a GPS sat fix when data connection is turned off (e.g. roaming or turned off manually). In GPS Status I see up to ten satellites (in grey or sometimes yellow colour) but even after hours I do not get the fix. When I turn on the data connection (either 3G or wifi) I get the fix in few seconds.
I have tried several ROMs now from Froyo, over Gingerbread to now CM7 RC0, but all show the same behaviour. I have recently downloaded the GPS fix from this thread: http://forum.xda-developers.com/showthread.php?t=953630 but it did not help at all.
I have deleted the /data/location folder, reseted the aGPS data several times, nothing got better.
I feel like sending the DEFY in for repair but then Motorola will check it with aGPS and send it back unrepaired because everything works.
So, if anybody has a solution or hint I woul appreciate it very much.
Thanks in advance...
HMM !
Same problem here
it is true, without agps data, very difficult to get fixed. That's why we need agps.
I have CM7, with GPS Monitor Free and AngelDeath's GPS fix 1.2.zip installed, I am able to get GPS lock in couple minutes without any Data (on fresh restart).
Give it a shot
GPS Monitor does not solve the problem
Hi there.
@teruyume
GPS Monitor did not help, it shows the same behaviour as GPS Status. Finds many satellites but does not fix!
Can anybody check if he has data in the folder /data/location ? I deleted it as stated in the FAQ for CM7 and the folder is not yet recreated. Might this be a hint?
I really cannot tell what the problem is: good reception (10 satellites) but no fix.
I have also been having trouble with GPS on the Defy. It will get a fix very quickly but moving the phone will cause it to lose its fix. It will go from having a lock on 8/10 sats to 0/1 to 4/5, etc. It won't hold the lock for long. I tried AngelDeath's GPS fix 1.2.zip and that helped speed up fixes, but it still drops the fix if the phone is moved at all.
@hartmuna
I made a backup of /data/location and then deleted its contents (not the folder itselft). Then I got no lock at all. I rebooted the phone and it automatically repopulated the folder and began performing the same as it did before. You might want to create the /data/location folder and just leave it blank, then reboot the phone and see if it will populate it again.
I also took a look at location.cfg and noticed a lot of settings in there that might be worth tweaking, but I have no idea what they all mean.
I found the data/location folder with terminal,don't know why it doesn't sure vida astro. deleted it again but that doesn't solve the problem.
I think I might give official gingerbread 2.3.4 a chance after the weekend. hopefully this will help?!?
Does anybody have experience with the leaked 2.3.4 and gps?
Sent from my MB525 using XDA App
I also had little problems to have the fix. And when I got (after several minutes) it loses during driving. The accuracy was too bad.
on CM7 rc1v2.
Anybody without GPS problems?
Hey guys, still no solution here. Tried every ROM out there.
One question: is anybody out there who does not have any problems with GPS fix without aGPS?
I am thinking of sending the DEFY in for repair...
With JBoogie3's blurry ginger rom I got 5 satellites used in fix in less than a minute (without internet). Try this rom before sending the DEFY in service.
same problem here, using last nighly and the problem still ocurrs, tried GPS-fix from angelofdeath but stil imprecise.
No solutions so far?
--
ive tried the GPS Monitor , he shows the lock, satellites, etc.. but, the gps with a "4 meters precision" put me on another street insted of mine, a mistake of ~50 meters (shows me on a paralel street instead of mine)
My standard Defy (still on Eclair) does fixes without Agps/data connection but after a trip of say 1000 km it can take up to 15 minutes to get a fix.
It also seems to help when I reset the Agps data first through GPS status (app).
GPS fix when not applying the UPDATE.ZIP
News from my side: I updated to CM 7 RC1v2 and this time did not apply the UPDATE.ZIP for my country described in this thread: http://forum.xda-developers.com/showthread.php?t=953630
And after few minutes I finally got a fix without aGPS data!
So my suspect is now the modified gps.conf. The original one is very short a has basically just the reference to the NTP and google aGPS server. The modified has far more lines that I have not yet studied in detail.
So, I will check the line of the gps.conf and try to find out what affects the GPS of the DEFY no to work...
Greetings from a happier DEFY user
That is good news. Would you be willing to copy/paste what is in your gps.conf file so that I can try updating mine without reflashing CM 7 and see if that solves my problem?
Brent099 said:
That is good news. Would you be willing to copy/paste what is in your gps.conf file so that I can try updating mine without reflashing CM 7 and see if that solves my problem?
Click to expand...
Click to collapse
Sure, you will find the original.zip with the not modified gps.conf and then I installed the europe.zip from the above mentioned thread.
So far I am able to get a fix but for my patience it takes much too long. I am afraid that the GPS antenna of the DEFY is crappy.
Will do some more testing, any additional info is very welcome...

[Q] GPS problem

Hello, I have a gps problem. I installed RunnyDroid 5. I have this radio:12.56.60.25U_26.10.04.03_M
can someone help me troubleshoot my gps problem. I can not get a gps fix at all...
Should I change the radio???
Try installing/configuring FasterFix first. My DHD took absolutely forever to lock on and some days not at all until I installed it.
If the problem persists then yeah I would suggest trying a newer radio.
My gps stops working every couple of weeks, I then use gps status & toolbox to clear and redownload A-GPS data. After that it works fine again.
GPS status & toolbox does help.
It can download latest almanac and ephemeris data to help fixing faster.
Or try using GPS in a good condition where there is no tall buildings or trees. Once you successfully locked GPS for one time, it would be MUCH FASTER to lock again even in worse condition.
Sometimes (when even gps-status isn't working) it helps to clear A-gps data, reboot, clear it again and then redownload A-gps data.

[Q] How do I get the damn GPS to work on a mate's Desire Z?

Hey all. I have a mate who bought a HTC Desire Z (S-OFF,already rooted, running CWM at the time, and an updated ROM), and I have just about tried everything to get the GPS to work. I have flashed the latest TMoUS G2 radio/rcdata (26.13.04.19), wiped the EFS, put the Andromadus GPS fix on there, installed Andromadus Mimicry ROM – version 1.5.0, installed the Engineering HBOOT, reinstalled the ROM, and still the stupid GPS still won't lock onto a single satellite. Is there anything I'm doing wrong?
Thanks in advance
Do you have a data plan or/and a wifi connection, with your DZ?
The A-GPS is much more quick to fix in this case, otherwise it can take several minutes...
XVI Ames said:
Do you have a data plan or/and a wifi connection, with your DZ?
The A-GPS is much more quick to fix in this case, otherwise it can take several minutes...
Click to expand...
Click to collapse
I currently have no SIM for the phone, but I am using my home wifi for net connection. I left the phone out about 10 minutes, but it still is searching for a GPS signal.
You've probably tried that already, but still...
Install "GPS Status" app from store, it' free. Disable data connection. Power down the phone and take battery out. Next get into open area, put battery back in and power it on. Then launch GPS Status and let it work for some time, may take a while - 10 to 20 minutes. There is an option in this app settings to keep screen on, use that.
And make note of what happens on the screen, after some time green points should start appearing, those are sattelites.
If that won't work - try again with data connection on.

Slim and fast rom

Hi to all
i'm using a defy+ only as GPS navigation. I'm also not using any simcard, just GPS and WiFI.
Do you know any stripped down rom with nothing installed except wifi and gps? I'm looking for a rom with maximum battery savings and quicker boot time.
Everything else is unneded.
ciripicchio123 said:
Hi to all
i'm using a defy+ only as GPS navigation. I'm also not using any simcard, just GPS and WiFI.
Do you know any stripped down rom with nothing installed except wifi and gps? I'm looking for a rom with maximum battery savings and quicker boot time.
Everything else is unneded.
Click to expand...
Click to collapse
You could try Maniac103's build of CM7.2. (It's available from his GitHub, and a slightly newer version is posted here.)
CM7.2 is one of the fastest and most stable roms for the Defy, and Maniac103's version has an LTO data download feature that helps a lot with GPS. If you enable that feature (it's either in settings or in the Defy Parts app, I don't remember exactly where), the phone will download the satellite Long Term Orbit data whenever you're connected to wifi. This LTO data is valid for either 7 days or 30 days (depending on which option you choose), and it helps the GPS to get a fix very quickly, even when you're offline. That's one of the few features I really miss from CM7.
Proverbs2 said:
You could try Maniac103's build of CM7.2. (It's available from his GitHub, and a slightly newer version is posted here.)
CM7.2 is one of the fastest and most stable roms for the Defy, and Maniac103's version has an LTO data download feature that helps a lot with GPS. If you enable that feature (it's either in settings or in the Defy Parts app, I don't remember exactly where), the phone will download the satellite Long Term Orbit data whenever you're connected to wifi. This LTO data is valid for either 7 days or 30 days (depending on which option you choose), and it helps the GPS to get a fix very quickly, even when you're offline. That's one of the few features I really miss from CM7.
Click to expand...
Click to collapse
Thank you for the response. My defy+ is actually on charging, when full charge i'l ltry to flash that rom.
So, with LTO data for 30 days, I can use WiFI (or any network connection) once in 30 days and getting fast fix for GPS?
ciripicchio123 said:
Thank you for the response. My defy+ is actually on charging, when full charge i'l ltry to flash that rom.
So, with LTO data for 30 days, I can use WiFI (or any network connection) once in 30 days and getting fast fix for GPS?
Click to expand...
Click to collapse
Ok, i've installed CM7. How can I check for LTO settings ?
ciripicchio123 said:
Ok, i've installed CM7. How can I check for LTO settings ?
Click to expand...
Click to collapse
I'm not using CM7 anymore (I've updated my Defy to Android 4.4 SlimKat), and I don't remember exactly where the LTO setting was. I think it was under Settings > Device settings, or something like that.
ciripicchio123 said:
So, with LTO data for 30 days, I can use WiFI (or any network connection) once in 30 days and getting fast fix for GPS?
Click to expand...
Click to collapse
Yes, you should get a faster GPS fix if you connect to wifi every 30 days. I believe it only downloads when connected with wifi, not a cellular data connection.
Proverbs2 said:
I'm not using CM7 anymore (I've updated my Defy to Android 4.4 SlimKat), and I don't remember exactly where the LTO setting was. I think it was under Settings > Device settings, or something like that.
Click to expand...
Click to collapse
Found it.
Yes, you should get a faster GPS fix if you connect to wifi every 30 days. I believe it only downloads when connected with wifi, not a cellular data connection.
Click to expand...
Click to collapse
Let me check. Before flashing a custom ROM, GPS fix in my actual location wasen't done in 10 minutes.
Now i've downloaded a monthly LTO data, let me see if fix is quicker.
EDIT: any way to greatly speed up the boot time? Almost 30 seconds stuck in motorola logo....
ciripicchio123 said:
Let me check. Before flashing a custom ROM, GPS fix in my actual location wasen't done in 10 minutes.
Now i've downloaded a monthly LTO data, let me see if fix is quicker.
Click to expand...
Click to collapse
Still no improvements, even with A-GPS and LTO data downloaded.
No fix in 5 minutes and just 2 sat found (as shown by GPS Status app). Same location with Galaxy S4 will result in a perfect fix in a couple of seconds.
ciripicchio123 said:
Still no improvements, even with A-GPS and LTO data downloaded.
No fix in 5 minutes and just 2 sat found (as shown by GPS Status app). Same location with Galaxy S4 will result in a perfect fix in a couple of seconds.
Click to expand...
Click to collapse
The first GPS fix always takes a while, unless you have an active data connection for A-GPS, which uses cellular towers and/or wifi to help determine your location. (Also, the Galaxy S4 has much faster hardware, but I'd guess that if you reboot your Galaxy S4 in airplane mode, and then try to get a GPS fix, it will take more than a few seconds.)
Make sure that the phone is outdoors under open sky, and that it is stationary while the GPS looks for the first fix. After that, subsequent fixes should be much faster, at least until the next reboot.
Proverbs2 said:
The first GPS fix always takes a while, unless you have an active data connection for A-GPS, which uses cellular towers and/or wifi to help determine your location. (Also, the Galaxy S4 has much faster hardware, but I'd guess that if you reboot your Galaxy S4 in airplane mode, and then try to get a GPS fix, it will take more than a few seconds.)
Make sure that the phone is outdoors under open sky, and that it is stationary while the GPS looks for the first fix. After that, subsequent fixes should be much faster, at least until the next reboot.
Click to expand...
Click to collapse
Is not an hardware issue. Defy doesn't see satellites. I've tried with S4 in airplane mode and fix is almost istant
ciripicchio123 said:
Is not an hardware issue. Defy doesn't see satellites. I've tried with S4 in airplane mode and fix is almost istant
Click to expand...
Click to collapse
Did you reboot the S4 in airplane mode, then try? That's pretty impressive if it can really get a cold-start fix that fast.
For me, a cold-start fix on the Defy usually takes a couple of minutes without a data connection, and sometimes it takes a minute or so before it even begins picking up satellites, so I guess that's normal for this hardware. On CM7.2 with the LTO data, though, it seemed a lot faster: a cold-start fix usually only took 30 seconds or so under a clear sky.
Proverbs2 said:
For me, a cold-start fix on the Defy usually takes a couple of minutes without a data connection, and sometimes it takes a minute or so before it even begins picking up satellites, so I guess that's normal for this hardware. On CM7.2 with the LTO data, though, it seemed a lot faster: a cold-start fix usually only took 30 seconds or so under a clear sky.
Click to expand...
Click to collapse
Even with LTO and a A-GPS data downloaded, gps fix requires many, many minutes.
After successul fix, subsequent fixes are faster even after a cold reboot (i don't know why, but is ok)
How can I decrease the boot time ?
ciripicchio123 said:
After successul fix, subsequent fixes are faster even after a cold reboot (i don't know why, but is ok)
Click to expand...
Click to collapse
Great! :good:
How can I decrease the boot time ?
Click to expand...
Click to collapse
CM7 boots about as quickly as any rom for the Defy, so you may not be able to make much improvement there. You could try uninstalling/disabling system apps that run at startup; that might help a little. Overclocking from the bootmenu will also help.
Proverbs2 said:
CM7 boots about as quickly as any rom for the Defy, so you may not be able to make much improvement there. You could try uninstalling/disabling system apps that run at startup; that might help a little. Overclocking from the bootmenu will also help.
Click to expand...
Click to collapse
could you tell me how to uninstall system apps and check what is starting at boot time ?
ciripicchio123 said:
could you tell me how to uninstall system apps and check what is starting at boot time ?
Click to expand...
Click to collapse
You could use an app like this to see what applications and processes are running after a fresh reboot.
You can disable system apps using the android settings menu. I don't remember exactly how to do it on CM7, but on Android 4.4 you can manage apps under Settings > Apps > All. (You can also access the app manager by hitting the menu button > Manage apps.) Select the system app you want to disable, and click the "disable" button. I think the procedure was similar on CM7.
Alternatively, you can just delete a system app using a root-enabled file explorer like ES File Explorer. In ES File Explorer, go to Tools and enable the "Root Explorer" option, then navigate to the system/app directory of your phone's internal memory and delete whatever apks you don't want. (Be careful not to delete an app if you don't know what it does, or you might cause more problems. If you run into errors or your phone is unable to boot after deleting system apps, just re-flash the CM7 zip from recovery.)
Omnirom
ciripicchio123 said:
Hi to all
i'm using a defy+ only as GPS navigation. I'm also not using any simcard, just GPS and WiFI.
Do you know any stripped down rom with nothing installed except wifi and gps? I'm looking for a rom with maximum battery savings and quicker boot time.
Everything else is unneded.
Click to expand...
Click to collapse
Hi, I'm also using my Defy+ for offline GPS (without sim, too)
Currently running Omnirom builds by Struq and Kayant (look in the "Omnirom for Defy" thread).
- Boot time is approx. 1'30, but no big deal for me (I'm not sure you will find custom roms with really faster boot times?)
- GPS hooking up takes some minutes (~maybe 3-5 mins) but I'm not even sure if I'm using a gps fix or not!
- battery usage : GPS & wifi are the most battery hungry components anyway
- I don't use Gapps , so that would qualify for "stripped down", only F-droid repository for apps, and the great OsmAnd for GPS nav :good:
Hello,
I have 2 defy "MB525 green lens" phones. On one of them (bought new) GPS works very well, 10-12 sattelittes at all time, first fix in cca 4 minutes withouth data connection. The only thing I've noticed is that the GPS really hates to "cold-start" when the phone is moving, i.e. inside a car. After fix, the signal strength ans sattelite count is OK.
On the second defy, GPS hardly sees a satellite. But the phone is from a hill climber, and I've got the phone with a smashed screen, the guy told me the phone falled some 30 m before hitting the ground... On opening it up I've noticed the PCB is chipped on one of the upper corners. New digitizer and everything else works....except for that GPS.
Perhaps the GPS chip is the most fragile component inside the phone... I don't know. But I think the software is not the cause here.

Anyone having/had issues with GPS?

I bought the Verizon variant (a505u?) And it loses GPS signal constantly. In maps (Google/Waze) it will lose signal and not update my position for maybe a minute. It will then update my current location and then lose GPS signal again.
I have uses GPS toolbox and reset/download the agps data with no help. I factory reset and it still did it. The only thing that ended up helping was to reset network settings in Android. That worked for about a week and I'm back to having issues again. The network reset didn't work a 2nd time.
Any thoughts or suggestions?
Wel, maybe not exactly your same symptoms (in my case, when it finally gets the GPS signal, it won't lose it easily for some hours, until apps stop to use it for a while). But indeed GPS of this phone is crappy to say the least.
I have also noticed that turning off 4G on both SIM cards and then rebooting makes the GPS fix work way much better. I don't have a clue how this can be but I'm sure it's not a case, it worked many times.
See this thread of mine for more details:
https://forum.xda-developers.com/galaxy-a50/help/gps-slow-initial-fix-4g-t3981877
I'm having issues with the GPS accuracy. The fix is almost instant, but often the position jumps by several 10 up to 100 meters away and back. Any idea how to fix it?

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