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Old October 23rd, 2012, 02:32 PM   #1 (permalink)
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Default GPS not accurate

Hello everybody, I have a GS3 and LOVE LOVE IT, Its only a couple months old, however I have noticed lately that the GPS either takes FOREVER to find me if it does at all. and once it does instead of showing EXACTLY where I am like it did when i first got the phone, it shows me off in the distance somewhere and does not FOLLOW as im driving!! HELP what can I do do fix this!! I live by my Google Maps GPS!!!


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Old October 23rd, 2012, 03:45 PM   #2 (permalink)
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Does it do this when your outside not near any cars or trees?
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Old October 23rd, 2012, 06:21 PM   #3 (permalink)
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Make sure you have all three GPSs tracking features turned on.

Settings/Location Services.
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Old October 23rd, 2012, 06:22 PM   #4 (permalink)
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First, have you made sure your GPS is enabled? That sounds like it's trying to use cell towers instead of actual gps. Sometimes referred to as coarse location. There's also "Google location services" which I'm not entirely sure what they use, but it's definitely not precise either.

Anyways, the simplest way to check is to pull down the notification bar, and make sure GPS is green. Now, when loading maps, you should see in the notification area that same GPS symbol will appear. ( The GPS actually isn't on when you enable it to save battery. The GPS antenna only turns on when an app requests a position update. This means you can leave GPS enabled all the time and it shouldn't affect your battery. As soon as you close maps, navigation, or whatever, the icon should go away which means the antenna is off. )

Also, make sure you have mobile data on at the time. It can take GPS a long time to get a correct position sometimes without a little help. Once you have your location, you can turn off mobile data again. It's only required to initially find your location.

Go into the Google Play Store and search for GPS Test. This will provide actual information of your GPS connection, such as number of satellites, strength of those signals, etc. A minimum of 4 GPS Satellites In Use is required. At 9 satellites you will have an accuracy of around 10-15 feet, pretty much the max. A signal over 10 should be enough to use that satellite.
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Old October 23rd, 2012, 08:29 PM   #5 (permalink)
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Actually 2 birds will tell you minimum info.

A third will give you altitude... but usually that is the worse info. Better off with an altimeter.

With newer GPS chips with 12 channel parallel info, locking in COLD should take less than 2 minutes.

Back in 1996 when I first got my first single channel Garmin unit it would be around 5 minutes to lock into 2-3 birds. But when I swapped it for a newer channel (again still in 1996 with the 12XL unit with 12 channels, it really did average a minute when cold. When hot, it was like under 20 seconds.

When I say cold, it means I turned off the unit and moved like 10 miles. Hot is turning it off then not moving turning it back on literally in the same location.

I am so amazed in the advancement of GPS units these days...
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Old October 23rd, 2012, 08:44 PM   #6 (permalink)
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You need 3 birds minimum, to get a location. The 4th bird is for altitude.

The accuracy is dependant on he geometry of the birds. If the 3 or four birds are bunched together in one portion of he sky, you will have a larger error. Place the birds widely seperated all over the sky and you will have a more accurate position.

Of course the satelites will be where they are, you can't control that. he best you can realistically expect is a position within a 3 meter radius sphere, altitude is the same accuracy as lat-long.

Our accuracy used to be within a 9 meter sphere, then hey turned selective availability off. There are GPS recievers capable of mm precision, this is based on the stability of the internal clock.

Our GSIIIs use both the American GPS sats and he Russian sats.
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