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Old July 23rd, 2010, 01:03 AM   #1 (permalink)
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Default Tested and Proven gps fix for Samsung Captivate

If you're one of the lucky folks who has a Samsung Galaxy (also known as the Vibrant or Captivate, depending on your carrier), you may have noticed a problem with GPS either taking a long time to resolve your position (or not at all), or your location being "way off." Lucky for your, the uber-geeks over at XDA-Developers cooked up a way to quickly and easily fix the problem!

This fix won't require any flashing of files, unlocking of bootloaders, or anything that could void your warranty, and reportedly Samsung is aware of the issue and is working on an "official" fix that shouldn't have any problems with this work-around.

To apply the work-around, follow these steps:

1. Navigate to Settings > Location & Security and uncheck the box next to "Use Wireless Networks".

2. Go to the phone's dialer and enter the number *#*#1472365#*#* then press send to access the phones LBSTestMode menu.

3. In the LBSTestMode menu, press “Application Settings” and change “Operation Mode” to “MS Based.”

4. Navigate to the “SUP/LCP Settings” and the SERVER & PORT to supl.google.com (make sure NOT to place “www.” in front) and port 7276.

5. Make sure the settings are saved and reboot your phone.

6. Navigate back to Settings > Location & Security and check the box next to “Use Wireless Networks.”


If you want to revert, simply follow the same instructions, replacing the settings in Step 4 with the original settings:
Operation Mode: Standalone
SERVER: www.spirent-lcs.com (with the “www.” in front)
PORT: 7275

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Old July 23rd, 2010, 01:19 AM   #2 (permalink)
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This finds my location (like many of the other "fixes"), but I can never get an actual GPS fix and the GPS icon in the notification tray keeps flashing.
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Old July 23rd, 2010, 01:22 AM   #3 (permalink)
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did u do an actual reboot with holding down both of the volume buttons and the power button when turning the phone on?
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Old July 23rd, 2010, 01:34 AM   #4 (permalink)
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I used the Switch Pro widget to do a reboot. Is that process any different?
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Old July 23rd, 2010, 01:57 AM   #5 (permalink)
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It locks on and gets the right directions, but my location is off by a half mile. Is that normal/okay even with this fix?
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Old July 23rd, 2010, 02:47 AM   #6 (permalink)
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Originally Posted by Surfer View Post
It locks on and gets the right directions, but my location is off by a half mile. Is that normal/okay even with this fix?

Mine locks in now also, but I'm about 1/2 mile east of where it thinks I am.
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Old July 23rd, 2010, 04:39 AM   #7 (permalink)
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This fix got it to find my location quickly as opposed to not at all but as others have said the accuracy seems to be way off.
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Old July 23rd, 2010, 06:48 AM   #8 (permalink)
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This worked great for me
AT&T claim to have no knowledge of problem
Thanks FLAVIO60
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Old July 23rd, 2010, 08:36 AM   #9 (permalink)
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In addition to the steps listed by the OP, you should set use skyhook to on in application settings.

I have dont this and my GPS is amazing. It locks in within seconds and I get 5 meters accuracy.
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Old July 23rd, 2010, 09:08 AM   #10 (permalink)
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A link to these exact directions was posted at the end of page 1 of the GPS sticky. Responses to this method are all over page 2. It didn't help most people (including me) - so I'm not sure it's really "tested and proven."
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Old July 23rd, 2010, 09:24 AM   #11 (permalink)
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Didnt work for me.
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Old July 23rd, 2010, 11:02 AM   #12 (permalink)
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This doesn't work
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Old July 23rd, 2010, 11:24 AM   #13 (permalink)
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Originally Posted by tysj View Post
This finds my location (like many of the other "fixes"), but I can never get an actual GPS fix and the GPS icon in the notification tray keeps flashing.
I am not sure that flashing GPS icon means that there is no GPS lock. I thought that the icon is flashing to indicate that GPS is in use.
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Old July 23rd, 2010, 11:53 AM   #14 (permalink)
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Just a FYI for those that are not getting this to help at all. Mine helped lock on, but the accuracy is still off.

Anyways, I had to go through this a few time to get it to work. After a reboot, I would go back into the settings and find that they didn't get saved. I re-entered the settings 3 times before they saved.
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Old July 23rd, 2010, 12:04 PM   #15 (permalink)
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Quote:
Originally Posted by JimmyJunk View Post
In addition to the steps listed by the OP, you should set use skyhook to on in application settings.

I have dont this and my GPS is amazing. It locks in within seconds and I get 5 meters accuracy.
Sorrry I got it.
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Old July 23rd, 2010, 12:19 PM   #16 (permalink)
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And flavio you forgot, before you play with these setting make sure you go to Setting>Location>and TURN OFF Wireless Network for GPS. For those who say it doesnt work, try that
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Old July 23rd, 2010, 12:38 PM   #17 (permalink)
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Originally Posted by Surfer View Post
And flavio you forgot, before you play with these setting make sure you go to Setting>Location>and TURN OFF Wireless Network for GPS. For those who say it doesnt work, try that
Whenever I try to turn off the wireless network for GPS, it shows that it is unchecked. But when I exit the settings then go back, the wireless network for GPS box is checked. What am I doing wrong?
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Old July 23rd, 2010, 12:57 PM   #18 (permalink)
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Originally Posted by njd911 View Post
Whenever I try to turn off the wireless network for GPS, it shows that it is unchecked. But when I exit the settings then go back, the wireless network for GPS box is checked. What am I doing wrong?
Hm I didn't notice that but what I did was-

Turn off Wifi
change the settings (as I stated above)
Then follow the guide
Reboot the Phone
Then turn it back on and turn on WiFi and enable Network. That should work
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Old July 23rd, 2010, 01:07 PM   #19 (permalink)
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Still can't turn off the setting. I'm getting really frustrated
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Old July 23rd, 2010, 03:08 PM   #20 (permalink)
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I've followed this and had very little improvement. When initially setting the location (for example, in navigation) it almost always has the wrong location. It will be in the vicinity but a few streets over.

So I don't think the qualifies as "proven." In fact, I'd wager that this is a firmware issue (probably a rounding error, poor garbage collection, or a data overflow) that won't be fixed until Samsung figures out where it is and fixes the drivers.
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Old July 23rd, 2010, 04:07 PM   #21 (permalink)
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I don't think this should be considered tested and proven. It does seem to improve the lock on speed for some. It did for me. The accuracy however is still and issue. Here are some gps tracks I recorded with the iPhone 3G and the Captivate with this "fix" applied. You can see that the accuracy of the Captivate is really quite bad. The problem seems to be that the captivate won't lock on to more than about 5 satellites at a time, and for that we need a firmware update from samsung.
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Old July 23rd, 2010, 06:42 PM   #22 (permalink)
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I couldnt even get a lock with factory settings in my house. All I did was set skyhook to on then rebooted and locks in about 15 seconds or less on google maps and under 10 seconds on maps.
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Old July 23rd, 2010, 08:30 PM   #23 (permalink)
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Quote:
Originally Posted by Flavio60 View Post
If you're one of the lucky folks who has a Samsung Galaxy (also known as the Vibrant or Captivate, depending on your carrier), you may have noticed a problem with GPS either taking a long time to resolve your position (or not at all), or your location being "way off." Lucky for your, the uber-geeks over at XDA-Developers cooked up a way to quickly and easily fix the problem!

This fix won't require any flashing of files, unlocking of bootloaders, or anything that could void your warranty, and reportedly Samsung is aware of the issue and is working on an "official" fix that shouldn't have any problems with this work-around.

To apply the work-around, follow these steps:

1. Navigate to Settings > Location & Security and uncheck the box next to "Use Wireless Networks".

2. Go to the phone's dialer and enter the number *#*#1472365#*#* then press send to access the phones LBSTestMode menu.

3. In the LBSTestMode menu, press “Application Settings” and change “Operation Mode” to “MS Based.”

4. Navigate to the “SUP/LCP Settings” and the SERVER & PORT to supl.google.com (make sure NOT to place “www.” in front) and port 7276.

5. Make sure the settings are saved and reboot your phone.

6. Navigate back to Settings > Location & Security and check the box next to “Use Wireless Networks.”


If you want to revert, simply follow the same instructions, replacing the settings in Step 4 with the original settings:
Operation Mode: Standalone
SERVER: www.spirent-lcs.com (with the “www.” in front)
PORT: 7275

I don't know if I would call this tested and proven fix. It does help lock onto the GPS but the accuracy is still very random. For example, I have used my GPS with these settings 4 times today. One has been all but perfect. One was OK. Two wereabsolutely horrible. I wouldn't consider 25% GPS working Good as a fix. Its an improvement but this phone (as nice as it is) still has MAJOR GPS issuez
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Old July 23rd, 2010, 09:54 PM   #24 (permalink)
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I can use GPS Status and the phone will show 5-11 sats in view, but will not lock to any unless you give it about 5-10 mins. I like to use the phone for RunKeeper so I have to set it outside so it can get a GPS signal before I go out just so it can track me and it still manages to lose the track along the route. For whatever reason sometimes I'll pull it out and go to Maps and bamm it just has the correct location right away.
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Old July 24th, 2010, 08:30 AM   #25 (permalink)
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Quote:
Originally Posted by mi04se1 View Post
I couldnt even get a lock with factory settings in my house. All I did was set skyhook to on then rebooted and locks in about 15 seconds or less on google maps and under 10 seconds on maps.
In general, GPS usually does not work in a house or other enclosed place. You have to have line of sight to get accurate GPS results.

The thing I noticed is that the Captivate is not a highly sensitive GPS. I have been using mine to find geocaches and such and as we are locating caches, the accuracy will show you that you are accurate within 5 meters or less which isn't too bad. Then, you go under some tree cover and it will drop to 98 meters (not too good) then it may drop to 1+ km off. I think this is the big issue with the gps. It's probably not software, but hardware.

D
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Old July 24th, 2010, 09:11 AM   #26 (permalink)
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Did you sideload crack your phone njd911 if you did you need to do the CHMOD thing its in the sideload thread.
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Old July 24th, 2010, 09:38 AM   #27 (permalink)
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Quote:
Originally Posted by dantheman2 View Post
In general, GPS usually does not work in a house or other enclosed place. You have to have line of sight to get accurate GPS results.

The thing I noticed is that the Captivate is not a highly sensitive GPS. I have been using mine to find geocaches and such and as we are locating caches, the accuracy will show you that you are accurate within 5 meters or less which isn't too bad. Then, you go under some tree cover and it will drop to 98 meters (not too good) then it may drop to 1+ km off. I think this is the big issue with the gps. It's probably not software, but hardware.

D
If you do go into the GPS testing software and do a position test, you will see that Captivate sees many satellites but chooses not to use them. Others devices reportedly use these satellites. This makes it hard to lock on to your position very quickly and accurately, which is why the GPS is slow and all jumpy at times. At certain times it may see 5 or 6 satellites but use none, which gives us the dreaded location unavailable error. This sounds to me like a software bug that can be resolved by a more liberal usage of the visible constellation of satellites, if it was a hardware issue it won't come and go like it does, at least I hope so.
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Old July 24th, 2010, 09:45 AM   #28 (permalink)
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Quote:
Originally Posted by dantheman2 View Post
In general, GPS usually does not work in a house or other enclosed place. You have to have line of sight to get accurate GPS results.

The thing I noticed is that the Captivate is not a highly sensitive GPS. I have been using mine to find geocaches and such and as we are locating caches, the accuracy will show you that you are accurate within 5 meters or less which isn't too bad. Then, you go under some tree cover and it will drop to 98 meters (not too good) then it may drop to 1+ km off. I think this is the big issue with the gps. It's probably not software, but hardware.

D
I tried the method above and stood outside in the open and had no luck. I did a master reset and when I got home I turned skyhook on a worked right away. I even tried turning skyhook on before I tried this method and it worked. Now it works indoors and outdoors, but Im not sure about accuracy yet.
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Old July 24th, 2010, 03:40 PM   #29 (permalink)
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It works fine for me now, thanks.
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Old July 28th, 2010, 11:53 AM   #30 (permalink)
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Default Some Improvement, but not ready for prime time

HI, I have attempted every fix as reported. The fixes helped some. Ultimately I returned the first phone for a replacement. The replacement was much better and locked relatively quickly. The problem is that while driving, the error range in Maps fluctuates a lot, enough so that while driving the phone repeatedly gives incorrect driving directions. I already have a Garmin that works well, but it's maps are somewhat in accurate.

Samsung/At&t please fix this problem. I love the phone, but as a GPS it is a failure and is dangerous to use as a navigation aid.

Does anyone else see it jumping from 5,10 meter accuracy to 100 m on a regular basis? Also at times it seems that LbsTestMode - Get Position Test might be better at holding a lock than GpsTest of Google Maps. Anyone else seen this behavior? THANKS
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Old July 28th, 2010, 12:01 PM   #31 (permalink)
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Hi,
I have done and experienced exact same thing as you..First unit never locks. Second unit locks (even though takes 5-10 mins sometimes), and fluctuates. I found that if I disable "use wireless networks" in locations setting, it jumps less often. I've tested it many times again, and it's almost usable now, with occasional error (ex., 5-10m fluctuations, where i end up on the local streets next to the freeway, and navigation re-routes).

Quote:
Originally Posted by JoelParke View Post
HI, I have attempted every fix as reported. The fixes helped some. Ultimately I returned the first phone for a replacement. The replacement was much better and locked relatively quickly. The problem is that while driving, the error range in Maps fluctuates a lot, enough so that while driving the phone repeatedly gives incorrect driving directions. I already have a Garmin that works well, but it's maps are somewhat in accurate.

Samsung/At&t please fix this problem. I love the phone, but as a GPS it is a failure and is dangerous to use as a navigation aid.

Does anyone else see it jumping from 5,10 meter accuracy to 100 m on a regular basis? Also at times it seems that LbsTestMode - Get Position Test might be better at holding a lock than GpsTest of Google Maps. Anyone else seen this behavior? THANKS
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Old July 28th, 2010, 12:01 PM   #32 (permalink)
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Quote:
Originally Posted by JoelParke View Post
HI, I have attempted every fix as reported. The fixes helped some. Ultimately I returned the first phone for a replacement. The replacement was much better and locked relatively quickly. The problem is that while driving, the error range in Maps fluctuates a lot, enough so that while driving the phone repeatedly gives incorrect driving directions. I already have a Garmin that works well, but it's maps are somewhat in accurate.

Samsung/At&t please fix this problem. I love the phone, but as a GPS it is a failure and is dangerous to use as a navigation aid.

Does anyone else see it jumping from 5,10 meter accuracy to 100 m on a regular basis? Also at times it seems that LbsTestMode - Get Position Test might be better at holding a lock than GpsTest of Google Maps. Anyone else seen this behavior? THANKS
Most people are having this problem even after the fix... Make sure you call Samsung and get to a LEVEL 3 tech to report the problem. Also Call At&t to complain! I've spoke to 4 people at At&t and they all said this was the first they heard of the problem.
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Old July 28th, 2010, 01:42 PM   #33 (permalink)
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Mine lock the location in about 3-5 secs with an accuracy of 300 meters. Better than nothing :-S
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Old August 20th, 2010, 03:09 PM   #34 (permalink)
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Thumbs up GPS 3x faster and 80x more accurate after settings change

Before applying the changes:
2-9 satellites found (no locks)
76 seconds TTF
400 meters accuracy
Continued to search, never locked

After the changes:
9+ satellites found (3 locked)
23 seconds TTF
5 meters accuracy
Locked.

Now I would say that this is a hell of an improvement! Good enough for me until Samsung rolls out a fix.

Note: Testing was done outdoors on a clear day in So Cal. Used the Test Position test from the GPS settings screen. Tested Google Maps and found location within a few seconds as well.
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Old August 24th, 2010, 11:26 PM   #35 (permalink)
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Default Got it to work

What seemed to work for me was to set the server and port to:
http://supl.google.com

Suddenly it can find my location in like under a second. I have SkyHook off and my WiFi is off, and I unchecked "use wireless networks" in the settings menu. The thing works splendtacularly. I can get it to work indoors and I could follow my movements very closely on Maps. It could track my movements within a small parking lot.

LbsTestMode says it's accuracy fluctuates between 5 and 10 meters (does someone know if that's radius or diameter?). It's connected to 10 saellites with the CNo (does anyone know what that is?) at between 12 and 30 dBHz. Also, I'm not sure what the asterisks next to the satellites mean. Anyway, I did the GPS test in hot start mode and after 30 times with a 10 second interval it said "Average is 1358882 ms," I'm not sure what it meant, but the tests would each take less than two seconds, and some would even take less than one.

Can anyone explain why this worked when the fix didn't work before? Does this trick work for anybody else?
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Old August 25th, 2010, 06:18 AM   #36 (permalink)
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It shouldn't work. What you set your SUPL server to does not affect actual GPS, which works in accordance with the actual satellites. SUPL/A-GPS works off of cell towers and will only give you an approximate location. Depending on where you are, it could be anywhere between 1-3 mile radius, which is obviously isn't very accurate.
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Old August 25th, 2010, 10:52 PM   #37 (permalink)
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Okay, so now I have a better idea of what's going on. So this afternoon I turned off my GPS to save battery, and when I turned it back on the battery wouldn't work. I ended up changing it back to supl.google.com and it started working again. It seems like having the server changed resets it or something.
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Old August 25th, 2010, 11:12 PM   #38 (permalink)
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Quote:
Originally Posted by George0211 View Post
It shouldn't work. What you set your SUPL server to does not affect actual GPS, which works in accordance with the actual satellites. SUPL/A-GPS works off of cell towers and will only give you an approximate location. Depending on where you are, it could be anywhere between 1-3 mile radius, which is obviously isn't very accurate.
My understanding is that SUPL offers a database that the phone can use to compute its location by helping translate the information from the satellites. I understand that GPS works by the device measuring its distance from different satellites, but I guess the phone doesn't have every satellite memorized, so it has to look that up.

At least, looking at how it behaves, and from my understanding of a brief skimming of the white paper (tl;dr) I'm guessing that's what it does.
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Old August 26th, 2010, 10:22 AM   #39 (permalink)
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Originally Posted by benbald72 View Post
My understanding is that SUPL offers a database that the phone can use to compute its location by helping translate the information from the satellites.
SUPL is a plane info database that uses wireless triangulation for ASSISTING normal GPS function. SUPL has nothing to do with satellites. When your NORMAL GPS (satellite based) works fine, it finds your location quickly without SUPL. To find sat based location you lock on at least 3-4 sats, and each of the sats broadcasts ITS OWN geo position. Once the phone has that info from 3-4 sats, it can triangulate its own lat/long position and elevation. It does not need SUPL for this. What SUPL is used for in the phones is obtaining QUICKER lock by triangulating on wireless signals. So when you fire up Google Maps you would first get your position within 100-1000 meters from SUPL or Skyhook and then by the time you realize it is not precise enough, regular GPS already obtains its own lock and the phone shows your more exact position within 10 meters.
Guys, I have to bed again, please before you claim you "fixed" your GPS, switch off wireless position assist in settings and only then see how many sats you lock on, and with what precision.

Now I do know that there is a chance that the bug in SGS (hopefully software bug) CAN be related to SUPL, for example the software weighs SUPL info more than regular GPS info, or by mistake neglects regular GPS if SUPL is available, or tries to treat sat signals with SUPL algorithms by mistake, or whatever else can be messed up.

Conclusion - let's wait for the Samsung fix. I do not think anyone can stumble upon a "fix" by themselves.
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Old August 26th, 2010, 11:21 AM   #40 (permalink)
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I do have "use wireless networks" turned off in the locations and security menu, and I have SkyHook turned off as well.
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Old August 26th, 2010, 11:28 AM   #41 (permalink)
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Guys, I have to bed again, please before you claim you "fixed" your GPS, switch off wireless position assist in settings and only then see how many sats you lock on, and with what precision.
I already reported that a few posts ago. Here's some more detailed readings I'm getting right now (both SkyHook and Use Wireless Networks are turned off):

TTFF/TTF: 6 seconds
Accuracy: 5.0 meters
Number of Satellites: 8

Now, usually I have around that many satellites anyway, but it won't lock on a position, and none of them have asterisks after them.
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Old August 26th, 2010, 11:37 AM   #42 (permalink)
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From Broadcom's SUPL white paper (PDF download):

Worldwide Reference Network
The performance of a mobile AGPS device depends on the number of satellites
included in the assistance data it receives. Broadcom’s Worldwide Reference
Network (WWRN) is the leading source of such data in the mobile communications
industry and has been a key factor in the commercial success of Broadcom’s AGPS
Server products. The WWRN is a global network of reference stations that
continuously tracks all GPS satellites and forwards their data to redundant Data
Hubs. Real-time data for the entire GPS constellation is streamed from the Hub
sites to all Broadcom SLP targets, enabling a single SLP to provide assistance data
or compute positions for mobile GPS devices anywhere in the world. Connectivity to
the WWRN is handled through VPN or SSH over the public Internet for developer
evaluation, operator trials and limited commercial introductions, and through
private frame relay for larger commercial systems. The WWRN is a pivotal resource
for mobile location services that rely on AGPS, not only because it frees MNOs from
the enormous task of having to develop, monitor, and maintain a GPS reference
network, but also because it offers AGPS performance benefits that cannot be
matched by a regional reference network. With data for all GPS satellites readily
available through the Broadcom SLP, MNOs can focus on delivering LBS applications
that take advantage of fast, accurate positions anytime and anywhere.

LTO Data
Building from GPS satellite data accumulated by the WWRN, Broadcom also offers
Long Term Orbit (LTO) data products. LTO is a complete set of orbit data for all GPS
satellites that is modeled in advance 5 and is valid for up to several days. This
extended validity period is a powerful resource for global roaming because it makes
out-of-network AGPS operation possible for days at time. For example, upon arrival
at an airport after an international flight, users may have difficulty connecting to
the regional wireless network to get access to positioning services. LTO provides
GPS assistance data that is largely unaffected by gaps in wireless service.




Like I said, SUPL provides a database of satellite locations. This is from page four of their white paper. If anybody reads the paper and disagrees with me, please let me know how you interpret it.
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Old August 26th, 2010, 01:04 PM   #43 (permalink)
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Guys,

Determining the current position of the GPS receiver is based on the distances of the receiver from the GPS satellites it's locked on to. Based on how far your phone is from at least 4 satellites, it figures out it's current location in 3 dimensions.
This is why having SUPL or A-GPS will not give you a completely accurate position, unless you are standing very close to the cell towers.
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Old August 26th, 2010, 04:00 PM   #44 (permalink)
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I've tried this fix on a number of occasions and every time it works great UNTIL the phone is rebooted. Once I reboot the phone, it doesn't work anymore.
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Old August 26th, 2010, 04:11 PM   #45 (permalink)
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I don't believe there is any fix that will work 100% time, will just have to patiently wait for an gps fix from samsung if it ever comes
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Old August 26th, 2010, 04:12 PM   #46 (permalink)
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Originally Posted by benbald72 View Post
I already reported that a few posts ago. Here's some more detailed readings I'm getting right now (both SkyHook and Use Wireless Networks are turned off):

TTFF/TTF: 6 seconds
Accuracy: 5.0 meters
Number of Satellites: 8

Now, usually I have around that many satellites anyway, but it won't lock on a position, and none of them have asterisks after them.
Was not trying to sound rude, I apologize.
Your numbers are very impressive, however I cannot reproduce them on my Captivate and that is the part that sux. So please forgive me losing my cool
I wish Sammy released a fix that would not require me playing with settings, that is just not right. Again a gripe, I am sorry
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Old August 26th, 2010, 10:08 PM   #47 (permalink)
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Quote:
Originally Posted by George0211 View Post
Guys,

Determining the current position of the GPS receiver is based on the distances of the receiver from the GPS satellites it's locked on to. Based on how far your phone is from at least 4 satellites, it figures out it's current location in 3 dimensions.
This is why having SUPL or A-GPS will not give you a completely accurate position, unless you are standing very close to the cell towers.
So the phone's GPS receiver can determine how far the phone is from various satellites, but then the phone needs a way to determine where those satellites are in order to turn the distances into a location on Earth. This is where SUPL comes it, it offers a redundant database of the positions of GPS satellites in orbit.

I guess other GPS devices either have this information stored in them or somehow get the information from the satellites themselves. Perhaps the problem is that the Captivate, for whatever reason, needs SUPL to determine where the satellites are, and the SUPL system on the phone is fussy. Hopefully the update will make it so the phone can determine its location even when it is not in range of any wireless network.
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Old August 27th, 2010, 06:20 AM   #48 (permalink)
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Quote:
Originally Posted by benbald72 View Post
So the phone's GPS receiver can determine how far the phone is from various satellites, but then the phone needs a way to determine where those satellites are in order to turn the distances into a location on Earth. This is where SUPL comes it, it offers a redundant database of the positions of GPS satellites in orbit.

I guess other GPS devices either have this information stored in them or somehow get the information from the satellites themselves. Perhaps the problem is that the Captivate, for whatever reason, needs SUPL to determine where the satellites are, and the SUPL system on the phone is fussy. Hopefully the update will make it so the phone can determine its location even when it is not in range of any wireless network.
The position of the satellite is part of the signal it sends to the receiver, along with a time-stamp, which says when the signal was sent. All GPS satellites send the signal at the same time. Based on that data and the fact that signal travels at speed of light, and knowing how long it took for the signal to get to your receiver, it can figure out where they are.

Now, dude, think about this for a second. If all you needed is a connection to internet so you could connect to SUPL server, why would you need a GPS receiver in your device at all?

SUPL server allows you to quickly figure out the general area where you are, because cell towers have GPS receivers on them.

Also, those numbers alone don't mean anything on this device. I get 8-10 satellites as well and it says accuracy 5-10 meters. Problem is, it puts me no where near where I actually am. I stood in front of my house and it put me literally over 2 miles away on the map, while saying it was accurate to 5 meters.
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Old August 27th, 2010, 10:41 AM   #49 (permalink)
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^^^ Thank you ! I could not personally prove that 5m accuracy is BS.
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Old August 27th, 2010, 11:34 AM   #50 (permalink)
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I appreciate this post. It might not be a true fix, but any improvement is great. The first time I used NAV....I thought my phone had A.D.D.
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