My Touch Pro ran TomTom flawlessly until a couple of months ago when I got a problem with the GPS device (not the signal) being lost every few seconds. It would reappear again for about 5 secs then off again. Despite soft resets etc, I suspected it might be the SD card at first as I tried many restart combinations with the card in/out etc and as it seemed to help on one occasion I put it down to that. But it did happen on a regular basis.
I now have the X1 with its superb GPS implementation, I was very impressed for a few days... until you guessed it, this problem started happening again!
Luckily I remembered the only setting I had done prior to this occuring was to use the Advanced Config application, where I enabled the AGPS feature. So... I went back in and disabled it and the problem disappeared immediately. I used Advanced Config on the Touch too, so that must have been the problem for sure.
I notice that AGPS is disabled by default. Why HTC did this must mean there is a problem with this feature.
So be advised, not to use the AGPS unless anyone knows good reason to and has a fix for the problem I mentioned.
I ran into the same problem. Turned on agps in advance config, used tomtom 7 and keep getting drop signal. It would pick up the sat signal for a few second and lose it, what interesting though when I use google map it would track me fine, no lost of signal. I can see my "dot" on google map moving along. When I drive, haven't tried it with other nav software to see if this was an issue. I still wonder why they have agps turned off though as default.
i think even if its set to "disabled", its enabled. a-gps must be hard coded in the hardware itself!
ps: i have the same problems when its "enabled".
I think it's the AGPS file that might have corrupted. You can solve this by re-download AGPS file and everything will be fine.
It happened to me once or twice, but it's not a reocurring problem so I did not bother much.
which agps file?
Guess you talk about an A-GPS setting in Tom Tom?
I cannot follow your conversation. With Mobile Navigator, which has no switch to enable or disable A-GPS it works pretty fine.
Sat-fix within seconds - thanks to the provided A-GPS function of the X1, which I don't think can be disabled on teh X1, until you don't update the information frequently with the Quick-GPS application.
Maybe Tom Tom can't interpret the A-GPS information?
How long does a Sat-Fix in Tom Tom take, when you disable A-GPS (in Tom Tom)?
Eric
we are talking about a tool called "advanced config tool". there is an option of enabling and disabling a-gps. "disabled" works best for most users...
you can have a 3d fix in seconds also with no a-gps.
Eric X1 said:
I cannot follow your conversation. With Mobile Navigator, which has no switch to enable or disable A-GPS it works pretty fine.
Sat-fix within seconds - thanks to the provided A-GPS function of the X1, which I don't think can be disabled on teh X1, until you don't update the information frequently with the Quick-GPS application.
Maybe Tom Tom can't interpret the A-GPS information?
How long does a Sat-Fix in Tom Tom take, when you disable A-GPS (in Tom Tom)?
Eric
Click to expand...
Click to collapse
It's incredibly quick (even indoors) to fix a position without AGPS. I admit I haven't knowingly had any noticable problems outside of TomTom but this is something I use a lot. It copes admirably inside, in built-up or shaded areas. No real need for AGPS then! I did try updating my QuickGPS file by the way, to no avail. Disabling was the only fix!
The FIX IS TOO FAST!!!
But I don't have this problem.......
DocMAX said:
we are talking about a tool called "advanced config tool". there is an option of enabling and disabling a-gps. "disabled" works best for most users...
you can have a 3d fix in seconds also with no a-gps.
Click to expand...
Click to collapse
My X1i doesnt have an "adavanced configuration tool" application. Is this a 3rd party addon that you have installed, or is my device just configured differently?
DocMAX said:
which agps file?
Click to expand...
Click to collapse
xtra.bin in \Windows directory I believe
one way to verify if the problem is due to the AGPS corrupted file, is if you encounter the problem, delete the xtra.bin and see if the problem goes away.
kiwiandy said:
My X1i doesnt have an "adavanced configuration tool" application. Is this a 3rd party addon that you have installed, or is my device just configured differently?
Click to expand...
Click to collapse
you have to download it http://forum.xda-developers.com/showthread.php?t=317070
it's our swiss army knife, but be careful
I think people may be getting confused between a-gps and what quickgps does.
My take on this is:
QuickGps downloads a file which contains a list of satellites to speed up getting a signal. Works very well on the x1
this is governed by HKLM/Software/HTC/QuickGPS
A-gps gets an approximate location from your cell tower and feeds 6 virtual satellites signals through the com port set up in the control panel.
It constantly does this, using memory-map software you can see that the signal drops and comes back every second or so. it seems to overwrite what is actually coming from the gps chip as I've seen 4 high quality satellite signals disappear to be replaced with 6 from the a-gps nowhere near where I was.
There's a setting in the registry section concerning A-gps which has "GPSmode" which is set to 2 I wonder what the other values are and do, I havent played with those yet.
You can change the refresh interval I set mine to be 5 when on foot
HKLM/Software/HTC/SUPL_AGPS
I agree with pretty much what you have said (the difference between Quick GPS [sometimes also known as Assisted/A-GPS] and the conventional, location-based AGPS)
However, I don't believe, unless somebody scientifically, or empirically prove, that the phone will receive virtual satellite feed/signal once it acquire the proximity based on the LBS signal. Because to do that, you need to have a data carrier, and it's either via GPRS/UMTS data connectivity (not possible since I would have noticed the data transmission), or radio frequency that satellites transmit on. It can't be GSM/W-CDMA since they operate on the different frequency as GPS, or if it indeed transmit the "virtual satellite signal" on the GSM/W-CDMA network, then I'm sure you will notice it as part of your monthly telco billing?
You may argue that the server is transmitting the virtual satellite signal on the GPS radio frequency, if so, that'll be new development in the AGPS technology since HP iPAQ 6515 first come out employ. However, there are few consideration point;
1. GPS radio frequency does not operate well across barriers, which means the 'virtual satellite transmitter' must be transmitting at a higher ground otherwise it won't work
2. The GPS receiver must be able to reconcile signal from virtual satellite signal and 'real' satellite signal, which means added layer of processing at the phone end, which in my opinions offer more complexity than effective solution.
That said, I just read that the Quick GPS service provider supports 50bit navigation raw data streaming, so I might be wrong afterall.
fards said:
I think people may be getting confused between a-gps and what quickgps does.
My take on this is:
QuickGps downloads a file which contains a list of satellites to speed up getting a signal. Works very well on the x1
this is governed by HKLM/Software/HTC/QuickGPS
A-gps gets an approximate location from your cell tower and feeds 6 virtual satellites signals through the com port set up in the control panel.
It constantly does this, using memory-map software you can see that the signal drops and comes back every second or so. it seems to overwrite what is actually coming from the gps chip as I've seen 4 high quality satellite signals disappear to be replaced with 6 from the a-gps nowhere near where I was.
There's a setting in the registry section concerning A-gps which has "GPSmode" which is set to 2 I wonder what the other values are and do, I havent played with those yet.
You can change the refresh interval I set mine to be 5 when on foot
HKLM/Software/HTC/SUPL_AGPS
Click to expand...
Click to collapse
zenkinz said:
I agree with pretty much what you have said (the difference between Quick GPS [sometimes also known as Assisted/A-GPS] and the conventional, location-based AGPS)
However, I don't believe, unless somebody scientifically, or empirically prove, that the phone will receive virtual satellite feed/signal once it acquire the proximity based on the LBS signal. Because to do that, you need to have a data carrier, and it's either via GPRS/UMTS data connectivity (not possible since I would have noticed the data transmission)
Click to expand...
Click to collapse
when you enable a-gps in the registry it establishes a data connection, or at least it does on my phone.
In my house I get a variable signal, it can drop the data connection easily (and does)!
When I first tried A-gps enabled in the registry it tried to connect, couldnt and memory-map reported no signal. It then connected I got 6 satellites listed till the data connection dropped. This makes me think it's using a data connection.
I disabled all data connections using paul modacos "nodata" and didn't get any "satellites" picked up. My quickgps was upto date at the time and outside I would expect to get a decent "proper" satellite lock.
the SUPL-AGPS section of the registry also contains the following.
Server IP 10.1.101.63
Server Port 7275
Which suggests some form of data connection. Remember this has nothing to do with quickgps or the ephemeris data that gets.
Have a look at http://wmexperts.com/articles/gps_vs_agps_a_quick_tutorial.html
&
http://en.wikipedia.org/wiki/GPS_Phone
A typical A-GPS-enabled cell phone will use a data connection (internet, or other) to contact the assistance server.
Click to expand...
Click to collapse
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edit Have just tried again to confirm what I wrote and not getting anything through a-gps at all! I wonder if there's something in this custom rom that's changed things.
But I am being told Ive got a HDop of 666.6m which is a bit spooky..
step outside and I got 9 satellites with 8m hdop back inside and I'm getting standard fix 5 sats 2m HDop flashing on and off every second (signal/no signal) but no data connection being used, so it looks like I'm wrong, so I'll take it all back!
Need to work out what's going on now..
I was having this same issue. At least its good that its not just my device. I tried deleting xtra.bin from both \windows and \temp and it did not help.
Just some clarification on QuickGPS and AGPS. For a regular stand alone GPS to connect, when it first finds a satellite it must download ephemeris data. The ephemeris data contains info about where all the GPS sats currently are in the sky. The ephemeris data is broadcasted by every satellite periodically. A regular GPS must wait for the beginning of the next transmission. If signal is lost mid transmission, the GPS reciever must wait for the next transmission and start all over again. Only once this data is downloaded can a lock begin to be calculated. What quickGPS does is download the ephemeris data from the internet so that next time you request a gps lock, this sometimes lengthy process can be skipped. quickGPS downloads a file called packed ephemeris and places it I believe in the windows directory.
AGPS on the other hand simply supplements info from the sattellites with info from the cell network. What towers you are currently near gives an approximate location (the mechanism that google my location uses) which then tells you which satellites to look for. When fards said it feeds virtual satellite info, he doesn't mean it actually broadcasts fake satellites via RF. It just feeds extra info to the GPS driver. Also, there are lots of calculations to do to maintain a lock. Once the receiver is getting sattelite signals it can send this information over the internet to the AGPS server which is a much more powerful computer that can do these calculations much faster. The server calculates the lock for you then sends you your position information back over the internet. This is why apgs enables a data connection.
Hi guys, I've been working hard for a while trying to track down a work-around to get gps to work properly, I've been testing my idea for about a week now and its been 100% effective for me so far.
Back ground:- I've been messing with every rom and they all exibit the same issue, "no azimuth or elevation data" is being received from the satelites. Without this data no location can be caluclated.
I stopped using Zeubeas ICS for a while as I wanted to use what should be a perfect, stable rom, as good as zeubeas rom is I didn't feel it was stable enough for my testing, so I ended up choosing cyanogen 7.2.0 as my choice.
First thing to note is that I have found that "gps test" by chartcross or gps status & toolbox by mobiwia eclipsim don't seam to work properly, as in they are supposed to have the ability to clear the agps data stored on the phone but from my testing it dosn't work hence why I struggled for so long beleiving those apps worked. So I stopped using them compleatly.
I Did find an app that does seam to work for me, it is also called gps test, but it is by Mike Lockwood, it shows satalite azimuth and elevation data and also seams to clear the agps data correctly.
I also use a really neat gps app called AndroiTS Gps test free, it has a nice gui, shows satalite azimuth and elevation data and more and doesn't seam to cause any conflict with gps apps.
The test condidtions:-
GPS on
3G & wifi off
Open either androiTS or gps test (then menu and start gps)
Wait a while, if you see numbers in the azim & elev other than 0(zero) you should eventually get location lock I have found that it takes no longer than 5 minutes to get lock, outside in the open.
Ok so you don't see azim & elev data, here's what I do to get it going again
Gps on of course
3G and wifi off (don't want any data or anything just yet)
Open gps test
Menu
Select clear aiding data
Close down gps test
3G data on, wifi off (having wifi on doesn't seam to help)
Open gps test
Menu
Start
Hey presto I see azimuth and elevation data again
When I do this I get really quick gps lock
Another thing I have noticed if you do the clear aiding data with 3G data off and wifi off then start gps you won't see azimuth or elevation data.
I hope this helps all the others with gps issues, if your getting gps issues and you can see the azimuth and elevation data but no lock this solution "may" also help.
I have not yet tried this idea on any other rom, so I don't know if it works as it does for me using cm 7.2.0, that is on my "todo list"
Happy Gps'ing
Update to this discussion.
I have now tried zeubeas beta 4 and out of the box I get no azimuzh or elevation data, the method I put forth above unfortunately did nothing to rectify GPS data either.
Sent from my Legend using xda app-developers app
I have been having an issue in obtaining a GPS lock on my Nexus 4, Maps can't pinpoint my location with WiFi off and GPS Test shows 22 satellites in view, but 0 in use. But when I clear AGPS data via the GPS Test app (note: I only clear, not re-download new AGPS data), the satellites refresh and is able to lock and use most of them, same for Maps. But this doesn't last, I have to clear AGPS data again the next day in order for GPS to get a lock from the same location (at home).
Obviously this isn't normal behaviour is it? Having to rely on a third-party app to reset AGPS, and so on.
The same behaviour happens on stock 4.3 with no other apps other than the ones included.
Bump.
SAme probleme here on a xperia go
did you find a solution, or at least, a widget for clearing Adata easily?
Hey,
as stated in the title, I have a problem with my H500f.
It's locking onto GPS sats. in like 15 seconds when I am outside and have the "GPS Test" app open, that's okay,
BUT when I open apps like Google Maps/Pokemon Go it looses the GPS fix and can't lock onto sats. for ages.
Whats the issue there? Any help is greatly appreciated!
Thanks in advance.
Hi Dwynr,
I discovered that my terrible location tracking was due to no longer having GPS, but relying on identification of nearby wifi networks. I used the GPS Status app and confirmed I wasn't getting a single satellite fix, even after AGPS refresh (see below). The (stupidly) simple fix in my case was to tighten all the screws inside the case, which then reconnects the loose GPS antenna. Saved me 3 weeks of RMA, at least.
If this doesn't help - when reading around I kept coming across the suggestion to refresh the AGPS data. If that's not possible within GPS Test, try it with GPS Status, which is also a free app and takes about 10 seconds to empty the AGPS cache and download a fresh dataset.
No real satelite from flat earth all use tower telecomunication informarion radius
How can i test the A-GPS signals of my S5 (both network and satellite)?
there is a way to improve positioning?
i'm sick to get lost in the wood
With "GPS Status pro". There are probably several apps with similar names. This app can also refresh the A-GPS database, but don't deal with other than GPS - based positioning.
In most cases apps want the exact position anyway, necessary or not, so u have to wait for a GPS fix even at home, with bad reception...