[Captivate Android Development] danquirk2000:
I just recently received a new Captivate today through the ATT insurance program that came preloaded with the JH7 Eclair build. The first feature that I was anxious about testing was the GPS since myself and others on this forum seemed to experience difficulty applying the OTA update from ATT. I drove an estimated 20 miles in the city and 15 miles on highway and noticed that I no longer experienced lag when making turns, or when I came to a complete stop and the navigation icon never jumped to adjacent streets or went over a 10m accuracy. I also was able to get a lock in 3-5 seconds while going 70MPH during my highway drive. When I returned home I rooted my phone and made a Nandroid backup and proceeded to flash cognition 2.4.1. Once I did this I decided to test the GPS again with a custom ROM installed and noticed that the GPS issues that I had previously experienced with my old phone were present once again. So after I tested the GPS on Cognition, I decided to restore to my original firmware and the GPS accuracy was restored to the favorable results as previously mentioned. What I am asking the community as well as the devlopers at XDA is if I provide you with my Nandroid backup files, would this be helpful in solving the GPS issues once and for all? I am just uncertain if maybe newer phones that came preloaded with JH7 may have different GPS settings than the OTA updates.

If the developers would like my Nandroid backup please just ask and I will upload.

UPDATE*

Here is the image file of the stock JH7 that has given me VERY accurate GPS results from the previous stated post. This is from a Nandroid backup and I do not know how you would go about installing this but I'm sure someone from here does and will test it. This has not been tested yet, but I respectfully challenge the developers and community to try this out to see if it is an improvement. This is an Eclair JH7 rom. Thank you for your time.

http://www.filefront.com/17508797/system.img/

http://www.sendspace.com/file/ryxaw1

UPDATE 2**

I went on about a 30 minute trip and here are my results

http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&msid=114887993519189258855.000494f37559dc102964c&t=h&z=12

** Please note you will need to zoom in to notice all of the turns that I made. I also made a U-turn and traveled on some of the same roads in opposite directions. Everything is just as accurate as the day before.

UPDATE 3***

I would like to extend my thanks to mattbeau for trying this out and posting his results. The results furthermore prove my hypothesis and are consistent with my results. I requested mattbeau to post detailed instructions on how to flash it so others can try. Please I encourage others to give this a try the more tests we gather the easier it will be for the Developers to find what makes this different.

mattbeau My Tracks: http://maps.google.com/maps/ms?msa=0&msid=208605913791985313826.000494f74ae16f5e33c81

UPDATE 4****

Very special thank to mattbeau for posting instructions on how to get this to work. Still need a few more people to test this but so far this is the most accurate the GPS has ever been on the Captivate here it is:

download the following: http://www.multiupload.com/CB5PFRTRYF

extract with winrar or what ever you want

so this is what is working for me.

ensure the clockwork update.zip is insalled on the root of your internal SD card

create a folder /sdcard/clockworkmod/backup/jh7gps/

copy system.img and nandroid.md5 to the above folder

Oneclick back to JF6

enable debugging under settings

using adb

adb restart recovery

select reinstall packages

(it will install teh clockwork recovery)

again select reinstall packages

select advanced restore

select jh7gps

select restore system

select yes

your phone will reboot with the new system.img installed

baseband is still jf6

If I could as that everyone that tries this please post their results. The more consistent this is the more things we can rule out.

UPDATE 5*****

I apologize that the megauploads links it temporarily unavailable. We are currently working on getting this back up as soon as possible. Also will be posting my My Tracks for day 3 shortly as well. I encourage anyone else to post their results as well.

Here is mattbeau's link that was originally on megauploads. Since some of you were having problems I moved it to here:

http://www.multiupload.com/CB5PFRTRYF

Let me know how this works out. I thank all of you for your assistance.

UPDATE 6******

Here is the My Tracks for the third day of testing. GPS accuracy does not appear to be deteriorating and have consistent results from previous tracks. This is looking more and more promising by the day. Comments are welcome!

http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&msid=114887993519189258855.00049509766fdff4bcb11&ll=34.720186,-77.346539&spn=0.005176,0.013078&t=h&z=17

Thank you mattbeau for your thorough comparison to other JH7 ROMs. Please keep us all posted on your findings.