[Trick] Speed Up Satelite Fix for GPS on Android

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dre_

Member
Sep 24, 2013
9
3
works on LG D724

Thank you now i can use offline navigation with out satellite issue.
 

chinhodado

Member
Feb 24, 2013
23
0
There is one thing that I'm not sure and I would like to know - the NTP server settings - do I need to have mobile data to use those NTP servers on the run? In other word, if I don't have mobile data, would changing the NTP server settings do anything?
 
NTP servers are "Network Time Protocol" servers. Your device/computer uses them to sync it's internal clock with an accurate Atomic Clock.

GPS relies on accurate time to calculate your position. Without a data connection, GPS should still work but it's accuracy would be affected if the internal clock on your device is no longer precise/accurate. I'd assume inability to connect to the NTP server(s) would result in a fallback to the devices internal clock.

Your device will also get it's time from your cell phone provider (provided you have it configured that way), which is hopefully also accurate as they should be syncing via NTP as well.

Sent from my SHIELD Tablet using XDA Free mobile app
 
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U.Pendragon

New member
Nov 27, 2017
1
0
@Primokorn

The servers you recommend don't respond to HTTPS requests.

The following do:
"https://xtrapath1.izatcloud.net/xtra.bin"
"https://xtrapath2.izatcloud.net/xtra.bin"
"https://xtrapath3.izatcloud.net/xtra.bin"
 

avd

Senior Member
Aug 17, 2009
796
210
What's the advantage to using SSL connections?

Sent from my PH-1 using XDA Labs
 

Primokorn

Senior Member
Nov 17, 2012
11,497
7,728
@Primokorn

The servers you recommend don't respond to HTTPS requests.

The following do:
"https://xtrapath1.izatcloud.net/xtra.bin"
"https://xtrapath2.izatcloud.net/xtra.bin"
"https://xtrapath3.izatcloud.net/xtra.bin"
It depends on the XTRA files you want to use.

However here is what I'm using now on my OP3T:
XTRA_SERVER_1=https://xtrapath1.izatcloud.net/xtra3grc.bin
XTRA_SERVER_2=https://xtrapath2.izatcloud.net/xtra3grc.bin
XTRA_SERVER_3=https://xtrapath3.izatcloud.net/xtra3grc.bin

What's the advantage to using SSL connections?

Sent from my PH-1 using XDA Labs
Maybe you should click on the above link...
this allows an attacker to mount a MITM attack on the network level and modify the GPS assistance data while in transit. While XTRA2 files do use a CRC checksum, it would be possible to re-calculate it.....
That's why I'm using XTRA3 + SSL now.
 
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veloc_h

Senior Member
Oct 10, 2019
74
8
It depends on the XTRA files you want to use.

However here is what I'm using now on my OP3T:



Maybe you should click on the above link...
That's why I'm using XTRA3 + SSL now.
The line NTP_SERVER=COUNTRY.pool.ntp.org
doesn't make sense to me.
"The 0, 1, 2 and 3.pool.ntp.org names point to a random set of servers that will change every hour. Make sure your computer's clock is set to something sensible (within a few minutes of the 'true' time) - you could use ntpdate pool.ntp.org, or you could just use the date command ..."
It might be more important to use "ntpdate pool.ntp.org" (how can this be done in gps.conf?
Why is this line missing?
REPORT_POSITION_USE_SUPL_REFLOC=1
 

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  • 523
    Guys,

    I decided to write this because a lot of us here still facing GPS issue on their device. I almost give up on my HTC Desire HD because of the GPS problem. After I find this trick, now I realized that HTC devices have one of the most brilliant GPS hardware. It always get a location lock within 5 - 15 seconds.

    This trick not only to speedup the satelite fixing. Some also found that it increase the reception (strong signal even during cloudy, light raining, and inside building's window). I am one of this case :D.

    Here is the tricks. It is tested on HTC desire HD, SGSII, and speculated to work on most Android device (Please note that it is in sequential order):

    Requirements:
    • Rooted Device
    • File Manager: e.g. Root Explorer


    1. Searching for NTP server information
    • At the right side of webpage, there is "Active Servers". Go in and look for the setting of your 1)region and 2)country
    • For example, one's region is Europe then you write down the NTP server for that: 0.europe.pool.ntp.org; 1.europe.pool.ntp.org; 2.europe.pool.ntp.org; 3.europe.pool.ntp.org
    • Then the servers for your country from the list down there and click the link(Example: Switzerland — ch.pool.ntp.org; 0.ch.pool.ntp.org; 1.ch.pool.ntp.org; 2.ch.pool.ntp.org; 3.ch.pool.ntp.org
    • The "Italic" words are the information you need to jot down for later use


    3. Modify the gps.conf file (Most Crucial Stage)
    • Copy the codes in grey box (in first post) to a notepad, then change the extension name from .txt to .conf then copy to your phone
    • Use file manager to copy to this location: /etc/gps.conf and replace the original gps.conf
    • Open and Edit the gps.conf using rootexplorer or others file managers
    • Change the COUNTRY and REGION in following lines with the info you got from the website just now. Keep other values unchange unless you know what it is. Example of REGION such as NorthAmerica, Asia, Africa, Europe.
    • Your new gps.conf should look as below:


    NTP_SERVER=0.COUNTRY.pool.ntp.org
    NTP_SERVER=1.COUNTRY.pool.ntp.org
    NTP_SERVER=2.COUNTRY.pool.ntp.org
    NTP_SERVER=3.COUNTRY.pool.ntp.org
    NTP_SERVER=0.REGION.pool.ntp.org
    NTP_SERVER=1.REGION.pool.ntp.org
    NTP_SERVER=2.REGION.pool.ntp.org
    NTP_SERVER=3.REGION.pool.ntp.org
    NTP_SERVER=COUNTRY.pool.ntp.org <-This is changed from the top line to here. It may works better if we put it here.

    XTRA_SERVER_1=http://xtra1.gpsonextra.net/xtra.bin
    XTRA_SERVER_2=http://xtra2.gpsonextra.net/xtra.bin
    XTRA_SERVER_3=http://xtra3.gpsonextra.net/xtra.bin

    # DEBUG LEVELS: 0 - none, 1 - Error, 2 - Warning, 3 - Info
    # 4 - Debug, 5 - Verbose
    DEBUG_LEVEL =0

    # Intermediate position report, 1=enable, 0=disable
    INTERMEDIATE_POS=0

    # Accuracy threshold for intermediate positions
    # less accurate positions are ignored, 0 for passing all positions
    ACCURACY_THRES=0

    # Report supl ref location as position, 1=enable, 0=disable
    REPORT_POSITION_USE_SUPL_REFLOC=1

    # Wiper (wifi positioning), 1=enable, 0=disable
    ENABLE_WIPER=1

    ################################
    ##### AGPS server settings #####
    ################################

    # FOR SUPL SUPPORT, set the following
    SUPL_HOST=supl.google.com
    SUPL_PORT=7276
    SUPL_NO_SECURE_PORT=3425
    SUPL_SECURE_PORT=7275
    SUPL_TLS_HOST=FQDN
    SUPL_TLS_CERT=/etc/SuplRootCert

    # FOR C2K PDE SUPPORT, set the following
    C2K_HOST=c2k.pde.com
    C2K_PORT=1234

    CURRENT_CARRIER=common
    DEFAULT_AGPS_ENABLE=TRUE
    DEFAULT_SSL_ENABLE=FALSE

    # TRUE for "User Plane", FALSE for "Control Plane"
    DEFAULT_USER_PLANE=TRUE​

    • Make sure the permission of the file is rw-r--r--

    4. Reboot
    • Go setting, turn on your "use GPS satelites" and "Integrate Google Navigation"
    • Restart the device (normal restart)[/B]

    5. Use GPS status and Toolbox
    • Tool available in market for free, please donate so developers are encouraged for better release in the future[/B]
    • Open app> tools> manage A-GPS state>Reset
    • Open app> tools> manage A-GPS state>Download
    • Optional restart device (not compulsory)
    • Use GPS status to start fixing satelites
    • Your satelite fixing speed should VERY FAST now
    • After get a successul GPS Lock, open your GPS applications and use like normal (e.g. Copilot, Sygic, or TomTom)

    Extra Suggestion: Please make sure your GPS is enabled before your device is turnoff or restart. It won't actually use GPS unless you open map-related app or google.com.
    CAUTION!!!: DO NOT use fasterfix after this. It will overwrite all the content in gps.conf


    Credits: Thanks for JMax and Vault Killer for the gps.conf file
    WARNING: Please do backup before messing with your device
    Do it at your own risk, I cannot be held resposible for any damage or dysfunctional of your device



    [Update: 17 August 2012]
    Sometime even my phone won't work consistently. It won't able to get fix within 30seconds everytime. And i found this tool can be very very help to make sure my agps 95% up to date and thus has the best performance.

    The tool is called "Leo AGPS Injector" developed by Tytung. Please click thanks or consider donation on the following post to thanks for the developer - Tytung. I have no credit at all for this tool. I just share it.
    Here is the link http://forum.xda-developers.com/showpost.php?p=16384028&postcount=1907

    Step to use the tool:
    1. Install and place the widget on your home screen
    2. Ensure your GPS setting is on
    3. Make sure you're conencted to Internet / Mobile data
    4. Press on the widget to inject AGPS data
    5. Now you're good to go. The internet can be turn-off now. and your gps should work well

    Note: I noticed once i connect to a big internet network (such as my university internet network). My GPS won't work anymore.
    This is what i do to make it back to normal:
    1. Connect to Mobile data (3G) and use "Leo GPS injector"
    2. if it is still not working, i switch to airplane mode and back to normal mode again, then repeat step 1
    And i notice, it works better if you use mobile internet, rather than fixed source internet at home. This is just what i feel, not necessary true.




    Please post your feedback to let others know it works on your device model

    Please click "Thanks" if you feel this post is useful for you
    7
    FasterGPS

    hi all,

    the trick is automated here, without all the fuss
    https://play.google.com/store/apps/details?id=org.fastergps&hl=en

    just for sharing ;)
    6
    Thank you very much for this post. :D

    Fortunately I've never had a GPS issue on my DHD, but still I would love to "fully" understand your solution ... ;)
    If it is possible, can you please explain what exactly these settings do, or can you post some links where I can find some extra info regarding these settings and their "ïmpact" for my DHD ..

    (Always curious, you know ! :D:D)

    # DEBUG LEVELS: 0 - none, 1 - Error, 2 - Warning, 3 - Info
    # 4 - Debug, 5 - Verbose
    DEBUG_LEVEL =0

    # Intermediate position report, 1=enable, 0=disable
    INTERMEDIATE_POS=0

    # Accuracy threshold for intermediate positions
    # less accurate positions are ignored, 0 for passing all positions
    ACCURACY_THRES=0

    # Report supl ref location as position, 1=enable, 0=disable
    REPORT_POSITION_USE_SUPL_REFLOC=1

    # Wiper (wifi positioning), 1=enable, 0=disable
    ENABLE_WIPER=1

    ################################
    ##### AGPS server settings #####
    ################################

    # FOR SUPL SUPPORT, set the following
    SUPL_HOST=supl.google.com
    SUPL_PORT=7276
    SUPL_NO_SECURE_PORT=3425
    SUPL_SECURE_PORT=7275
    SUPL_TLS_HOST=FQDN
    SUPL_TLS_CERT=/etc/SuplRootCert


    # FOR C2K PDE SUPPORT, set the following
    C2K_HOST=c2k.pde.com
    C2K_PORT=1234

    CURRENT_CARRIER=common
    DEFAULT_AGPS_ENABLE=TRUE
    DEFAULT_SSL_ENABLE=FALSE


    # TRUE for "User Plane", FALSE for "Control Plane"
    DEFAULT_USER_PLANE=TRUE


    and, what exactly is meant by

    4. Reboot
    Go setting, turn on your "use GPS satelites" and "Integrate Google Navigation" rw-r--r--
    Restart the device (normal restart)[/B]

    Do you want me to put permissions on a settings selection in the "Settings - Location" options ?

    Sorry if my question is unclear, but I'm a bit puzzled by that part of your solution post.

    AGAIN !! Thanks for the nice post and great effort .. Much appreciated !! :D
    5
    @Xenova

    For these reasons: https://wwws.nightwatchcybersecurity.com/2016/12/05/cve-2016-5341/

    I think you should update OP using https instead of http:
    XTRA_SERVER_1=https://xtra1.gpsonextra.net/xtra.bin
    XTRA_SERVER_2=https://xtra2.gpsonextra.net/xtra.bin
    XTRA_SERVER_3=https://xtra3.gpsonextra.net/xtra.bin
    5
    If I missed the answer, I apologize, but I noticed a lot of people wondering how / why this works.(Yes, I know it's an old thread, but figure people may still want an answer.)

    The biggest factor is that this gps.conf enables Assisted GPS (A-GPS). AGPS is a technique which uses the cell tower you're connected to to approximate your location, and using that approximate location and GMT (Grenwich Mean Time) to identify the satellites your GPS chip looks for.

    Normally, on a cold start, a GPS simply starts scanning the sky for all GPS satellites. There are currently, I believe, 31 functioning satellites in the US system. Since the GPS has no idea which of those 31 are visible to your receiver, it can take a long time to find and lock on to the minimum # of satellites to enable a location fix (3 for a 2 dimensional fix, 4 to get altitude).

    But the GPS satellites are in predictable orbits. If you know the time, and your approximate location, you can know which satellites are going to be visible in the sky above you. That's what A-GPS does. Your NTP time server tells it the time, the cell tower tells it your location. The GPS can then easily calculate which of those 31 satellites are overhead, and lock onto those very quickly while ignoring all the rest.

    There is a potential downside. If you're not connected to a cell tower, A-GPS doesn't know where you are. Some phones won't provide GPS lock at all in that case. So you might want to keep the original gps.conf on your phone, renamed as gps.conf.back, so that if you find yourself in an area without cell service, and GPS isn't working, you can revert back to the original file.