Hi
I'm developing a GPS application to assist devices with onboard GPS chips (eg. Trinity) to obtain a fix faster.
My application works fine thus far, however I have a question in regards to TomTom. Every other application works instantly, ie. they report the fix obtained as "Valid" and start displaying the location on their GUI almost instantly.. EXCEPT for Tomtom.
Does anyone know what TomTom looks for other than a 2d/3d fix? It detects its receiving information yet hangs on "Lost GPS signal since xxx seconds" for around 2-4 minutes and THEN it starts working fine.
I'm confused as to why this is only happening with TomTom so any information you guys have would be greatly appreciated.
I'm not sure what your application does to assist, or which other applications work fine. But I'll take a guess. Tom-Tom is a stand alone GPS app and the others use assited GPS?
Satellites transmit ephemeris data, data about the orbit of the GPS satellites, every 30 seconds. Tom-tom must lock on to the salelliites and wait a minium of 30 seconds to recieve this data. If the other GPS applications use assisted GPS, they get help from a location based server (LBS) run by the cellular provider. The LBS sends the ephemeris data and other data to help the GPS lock onto the satellites quickly, so the GPS doesn't have to wait.
I'm pretty sure the following tip is accurate. I received yesterday a new HD, my first having broken just by pressing the screen! I was very relieved that just by reinstalling from memory card all my apps, that the apps settings were still valid - I didn't fancy having to go all through setting up tomtom again with pocketgps camera database and warning tones.
However I did notice that after switching Tomtom on, it was hit and miss whether my unit found any satellites. By going into the satellite status screen, I could see that the software would access the satellites for a few seconds then lose them again. I also noticed that a fix for this was to run google maps first and turn on gps from there.
This was strange, since my previous HD, locked on within seconds every time. Hardware issue? Maybe, but thought I'd try to remember anything I hadn't done on my new HD that I had on my old.
"Ha-Ha" I thought, I haven't run the connection wizard, and this is sort of a connection issue.
Start --> Settings ---> Connection ----> Connection Set Up-----> Tap O.K. ----> restart
Now TomTom works perfectly and picks up connections immediately without google map initiation.
Try it if you having similar troubles!
cheers,
mooro
For me this must be a placebo, neither do I understand why the connection setup has anything to do with the gps chipset, nor does it work me. I have configured my connection using the connection setup and nevertheless I have some gps drops with iGO.
I think this gps drops have some other background, I will try a new radio version. Some people also said that it might help to change the polling interval, but for me neither an increase nor a decrease of the interval has changed anything about it.
Not a placebo for me, is working perfectly now.
mooro1973 said:
Not a placebo for me, is working perfectly now.
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Click to collapse
Nobody has said that placebos don't work, but the reason why they work is controversial. Maybe you have done something else, because I really can't imagine how the connection setup could fix a problem with the gps.
However, its good to know that it runs for you, maybe it will work for me with the new radio also.
How about this theory:
Because you did not do the connection setup yet, the GPS Quickstart had not run yet. So no almanac of GPS satelite data existed yet, meaning it was an icecold start?
And Google Maps worked faster because it is using the 'about' position of the GPS towers to bootstrap the location?
Placebo works only for those that believe in it!
This device is A-GPS capable.
Don't know whether e-plus supports A-GPS services but in theory this might be a clue
I have tried all of the above and still I cannot get GPS to work
If I open google maps it just keeps searching with indicayor showing no satellites.
When using TomTom it displays a number of satellites but all appear grey and none become active
Advice welcome
Fallen Spartan said:
Advice welcome
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Click to collapse
It may be too obvious to mention, but: Did you try this outside with a good sky view? Cold start is always a bit more tricky.
Fallen Spartan said:
I have tried all of the above and still I cannot get GPS to work
If I open google maps it just keeps searching with indicayor showing no satellites.
When using TomTom it displays a number of satellites but all appear grey and none become active
Advice welcome
Click to expand...
Click to collapse
have you tried start ---> settings ----> external gps --->access---> check manage gps automatically?
and in google maps, options-->gps settings---> toggle auto/windows?
I am fairly sure intermittent gps is a memory problem of some sort. I used to get that a lot running IGO. Now I kill TouchFlo every time before running IGO, and even thought the problems still happens sometimes, it is clearly much less often. You can find the description of how to kill TouchFlo using Mort script in IGO thread. This makes the whole thing clearly better (not perfect).
mooro1973 said:
have you tried start ---> settings ----> external gps --->access---> check manage gps automatically?
and in google maps, options-->gps settings---> toggle auto/windows?
Click to expand...
Click to collapse
It may be too obvious to mention, but: Did you try this outside with a good sky view? Cold start is always a bit more tricky.
Click to expand...
Click to collapse
Tried both of these.
Yes I can see that satellites are being picked up but both google maps and tomtom don't fix onto any of them. They all just appear grey
Maybe you should try a tool by htc to try and wakeup your gps. Run the file on your HD and from function menu select chip and then q7200. Choose port 4 and baud rate 4800. Then open the port and wait for a gps fix. After that close the port and exit the gps tool. Then run your gps navigator and see if it works!
Hi,
I had issues with GPS and tomtom 7.
I discovered that it was caused by a modification I did to the registry with HD Tweak.
Here is what I did:
going thru the settings with HD Tweak I seen that default value for AGPS was Disabled so I decided to set it to enabled it as I now the phone is capable of it.
After that The GPS would only work once with tomtom, if I closed tomtom and re open it again it GPS would not be found, I had to reboot the phone for it to work again (for an other single use).
I restored the AGPS value to Disable with HD Tweak and everything worked perfectly after.
Though I noticed that tomtom will still use AGPS when GPS sensor is down, but I can say if this is how it used to worked before the registery tweak because I did the tweak immediately after installing tomtom.
I had a similar problem with Advanced Config after I turned on Quick GPS Fix, turning it off seemed to fix it.
michael_r said:
I am fairly sure intermittent gps is a memory problem of some sort.
Click to expand...
Click to collapse
I don't think so. My "fix" (as I reported in another thread) is to change baudrate in IGO GPS configuration. After one or few baudrate change, the connection is stable.
No one as reported this fix not working.
So it seem a virtual COM port issue..
rushmpeg said:
Hi,
I had issues with GPS and tomtom 7.
I discovered that it was caused by a modification I did to the registry with HD Tweak.
Here is what I did:
going thru the settings with HD Tweak I seen that default value for AGPS was Disabled so I decided to set it to enabled it as I now the phone is capable of it.
After that The GPS would only work once with tomtom, if I closed tomtom and re open it again it GPS would not be found, I had to reboot the phone for it to work again (for an other single use).
I restored the AGPS value to Disable with HD Tweak and everything worked perfectly after.
Though I noticed that tomtom will still use AGPS when GPS sensor is down, but I can say if this is how it used to worked before the registery tweak because I did the tweak immediately after installing tomtom.
Click to expand...
Click to collapse
Yeah !!! Seems to work on my side !! I just spent minutes fighting with my HD this afternoon, still loosing the GPS device... I had to activate one other GPS app to make it work. Now I just changed this setting and it seems to work !!
Thanks for the info ! You're my king
Worked for me by turning off a-gps in HD Tweak and enabling it through the gps app on the rom.
after flashing the 1.10.25.25 radio on my HTC diamond, The GPS signal goes on and off, on and off....continuously on the TomTom GPS status. it was strange, I have to use QuickGPS to download the data again on open air to get the signal on continuously again. If I download the data inside my house, it just go on and off again when I use it on open air.
Is there a way to set my Diamond to turn on the 3G connection when I use Tomtom? It turns on when I go into IE and Opera, but when i go to Tomtom it doesn't activate.
Thanks for the help
as far as I know, you dont need 3g or any internet connection for that matter when using TomTom. As long as you have TomTom and the proper maps installed, you can just get all the data you need via your internal GPS reciever.
Ive been connecting to 8-14 gps satellites with the nodata cab installed and all toggled to off, as well as schap's advanced config tool with all network settings to off.
im using 3g connection to get traffic update,you cant receive it with the internal gps receiver!
just try to do traffic update and be sure that the settings are correct ,wap or something instead of your isp
Tnanks for the replies. I could be wrong here and totally off my rocker, but I thought that I get faster signal lock when I have 3G on.
Again, could be way off and I was just seeing things.
djcedric is right about the traffic update. Cvrle1, as far as i know, you are wrong about the faster signal lock. If you use the QuickGPS app via 3G or wifi or whatever data connection you use, it downloads the newest satellite data to your phone, giving a very fast signal lock. After I have the QuickGPS settings it takes me about 1-3 seconds to find all the satellites.
Note that the quickGPS settings are only valid for a week, when it expires you have to run QuickGPS again, otherwise it takes considerably longer to find the satellites.
Hope this helps.
Has anybody noticed that if you use the gps status app before you use the google maps that the gps connect quicker for any app using gps such as maps, weather, where, etc... until phone reset.
When I run google maps first gps would just search for several minutes and sometimes wouldn't even find the location. So for anyone with gps issue probably try the gps status app from the market first.
I'm wondering if the gps status and google maps access the epic 4g gps differently... just a thought
Sent from my SPH-D700 using XDA App
I did what you suggested and indeed the gps locked much faster on google maps when I used GPS status first.
three epics here. extensive GPS testing over weeks now.
what you are seeing is gps status forcing aGPS vs "use wireless location, whcih is not aGPS.
If your ephemeris is new or has been cleared (the Epics main problem is not clearing ephemeris) you get an aGPS lock in seconds on GPS/aGPS only application like GPS status. But on application that can use either location method, the non GPS Use wireless networks" or the GPS, it often tries to get a wireless tower location first.
I get the identical affect by turning off the tower based system by keeping "Use wireless networks" normally off. this gives me instant aGPS locks five to ten seconds in proper conditions at all ties with cold start enabled.
Hi to all
I have gen1 blade with tpt for gen2. Currently it is with cyanogen-mod 7 ROM. I'm pleased with this phone but it does have one problem. GPS is not working!! To be exact device fails to "see" any satellites. With WIFI I get lock but only because of WIFI and trace of IP address. I heave used modified gps config file but that got my AGPS working, not regular GPS.
I have tried to find service manual on internet and failed....
Any ideas on how to solve this? I did check antenna connections that i could see and all seams to be fine.
No one?
I have tried Swedish snow rom but had same problem. replaced original gps.conf file;e with modified one and still had problem.
I guess u have not switched on the location services.
Go to settings location services then tick mark all and in GPS source select internal
Sent from my Blade using xda premium
udaytalwaronline said:
I guess u have not switched on the location services.
Go to settings location services then tick mark all and in GPS source select internal
Sent from my Blade using xda premium
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Click to collapse
AGPS works. I do get position according to WiFi but as i leave WiFi covered area I don't get tracking. No updated GPS position, according to software there is no visible satellites.
I have given up on getting this fixed. I have tried different ROMS and programs. Only when i get location from WiFi using ether Google maps or Locus I have position. Using GPS Test app i never get position. Same goes for other apps. I do have old (5 years old) BT GPS dongle and he finds position and satellites within 1minute using this mobile.
I have tried to find service manual or some sort of technical info about GPS in this mobile but found nothing.
grunf said:
AGPS works. I do get position according to WiFi but as i leave WiFi covered area I don't get tracking. No updated GPS position, according to software there is no visible satellites.
I have given up on getting this fixed. I have tried different ROMS and programs. Only when i get location from WiFi using ether Google maps or Locus I have position. Using GPS Test app i never get position. Same goes for other apps. I do have old (5 years old) BT GPS dongle and he finds position and satellites within 1minute using this mobile.
I have tried to find service manual or some sort of technical info about GPS in this mobile but found nothing.
Click to expand...
Click to collapse
Do you have any screenshots from GPS Test app at least?