UK Users How Accurate Is Your Position?

Discussion in 'iPhone' started by wrkactjob, Aug 10, 2010.

  1. wrkactjob macrumors 65816


    Feb 29, 2008
    Please state your phone provider and what app your are using to determine your current location.

    For me IP4, O2, Google maps, I'm about 1.5 miles away from myself in London.

    Personally I think it makes a mockery of the find my iPhone/iPad app.

    I guess with a TomTom app it's using satellites so would be more accurate?
  2. robbieduncan Moderator emeritus


    Jul 24, 2002
    iPhone 3, O2, Google Maps.

    At home: very accurate. Within 10-15 meters.

    At work (inside a tall building with poor phone reception): pretty accurate. It thinks I'm in Jubilee park which is just outside our building. I am on that side of the building at least!
  3. nednarm macrumors 6502

    Apr 26, 2010
    It's very accuarate for me, however I live in quite a good 3g area. Saying that though even when I'm on GPRS mine seems very accuarate
  4. DJ567 macrumors regular

    Mar 10, 2006
    London, UK
    using iphone 4, google maps, on o2...
    without a view of the sky i.e. indoors, the pin drops on or around my house (or any other building), usually within about 20 metres actual

    with a view of the sky it shows me essentially the same thing with a better degree of accuracy 5-10 metres, certainly good enough for me
  5. molala macrumors 6502a

    Oct 25, 2008
    Cambridge, UK
    iPhone 3G, O2, google maps

    i'm in Cambridge.

    very accurate most of the time, within 5 meters. if i'm in a big building, then 10-15 meters.
  6. andybno1 macrumors 68040


    Nov 6, 2007
    Liverpool, UK
    gps doesn't rely on being on a 3g or gprs connection it has it's own antenna.

    as for accuraccy my phone is bang on well give or take a couple of meters
  7. wlf macrumors member

    Jun 21, 2010
    I'm in London. Using google maps, sometimes it is way off (approx 1 mile) but usually corrects itself before too long.
  8. adztaylor macrumors 68000

    Aug 20, 2009
    Preston, UK
    Extremely accurate, and I live in a small village. Really impressed.
  9. cambookpro macrumors 603


    Feb 3, 2010
    United Kingdom
    iPhone 4, O2, Google Maps

    Very accurate. Within 5-15 metres.
  10. Nuttydev macrumors 6502

    Mar 6, 2009
    Bristol, England.
    Very surprised at the accuracy, landed up on my lane rather than my house but it's only 10 meters off. This is on GPRS as well. On O2, google maps.
  11. ag227 macrumors regular

    Jun 11, 2007
    If im not mistaken does it not use mobile tower triangulation and wifi networks to give a rough position first, then it gets more accurate when it gets a satellite fix and then even more accurate with more satellites. Im not sure if the first bit depends on the mobile network or not, as it might just use your networks towers for triangulation or all the networks?

    This will most likely be why yours show you as a mile or so away, as its not got a satellite fix. If it never gets a fix and gets more accurate I would say you have a problem with your phone, give it chance to though and it works best if you have a clean line of sight to the satellites, ie outdoors and no trees etc.

    Mine in my house drops the pin on my house with the ring circling my house, outdoors its accurate to about 2 meters.
  12. tico24 macrumors 6502


    Jun 17, 2007
    Eastleigh, UK
    I use the app Device Locator and have it set up to push my location to Google Latitude.

    Right now it's about 10 metres out. It's rarely more than 100 metres out for me.
  13. davehutch macrumors 6502a


    Mar 5, 2009
    Croxley, Herts
    The phone uses Cell Towers and Shyhook (Wi-Fi networks) first.
    Then uses that data to look at the expected satellites in range.

    GPS accuracy is limited by the US military to no better than 20ft or so

    Mine is as expected on O2 using all map apps. Try downloading "Elevation For Real" which states horizontal and vertical accuracy:
  14. Mr dj mo macrumors member

    Mar 4, 2010
    Near my iPhone.
    Im using a 3GS with cellphone connected I work in a tall building and alway get perfect GPS reception.

    Maybe it's an error with you're phone?!?
  15. nednarm macrumors 6502

    Apr 26, 2010
    I know what GPS is. I believe the phone uses 3g and gprs to give a more accuarate location.
  16. AdamA9 macrumors 65816

    Feb 2, 2010
    I'm sitting still in an office building and my blue dot is moving around as if I'm walking LOL - After a few minutes of doing this, it eventually settled down and laded pretty much on my head over the office building.

    Using iPhone 4, o2 and maps. :D

    EDIT: Wait, it's on the move again and gone for a walk up the road! Now it's about 100 meters out :(

    EDIT: Wait again, it's come back - this is not very good it keeps going for a walk, but it's back on my head again now.
  17. BlackViper macrumors member

    Mar 2, 2010
    You've got it backwards

    Location services uses the cell towers to get an estimate of your location; this reduces the time it takes for GPS to get a fix. GPS works best with line of sight to the satellites, if your indoors or in an area with lots of tall trees or buildings, you will not get as accurate measure of your location. Wi-fi can also be used If you can find a network registered with Apple's location database.
  18. jacksam101 macrumors member

    Dec 27, 2006
    Crewe (UK)
    I'm on O2 and my location is spot on at home and various work locations.

    I don't have great signal at home (1-2 bars only) whereas in Bristol I have full 3G signal strength and both locate me very well.
  19. Daveoc64 macrumors 601

    Jan 16, 2008
    Bristol, UK
    There are perhaps three things that people are mixing together here:

    Cellular "triangulation" or Wi-Fi "triangulation" - these use a database of cellular base stations and Wi-Fi hot spots to determine where you are based on the signals that your phone is receiving.

    GPS - using the Global Positioning System Satellites to establish where you are

    Assisted - GPS (A-GPS) - using the GPS plus a connection to a server (which can happen over a 2G, 3G or Wi-Fi connection) to work your location out much quicker (the server can perform the necessary calculations to work out your location much faster than the phone can)

    GPS can function fine without a data connection (although most people will want to use it in conjunction with a mapping application that usually needs a data connection). The other two types need a data connection to function correctly.

    It's not really helpful that people are used to the GPRS - these acronyms are very confusing!
  20. rockjam macrumors newbie

    Nov 23, 2008
    Mine is way off

    I have an iPhone 3GS running iOS4 no JB and an iPhone4 with JB.

    The iPhone 3GS has no problems.

    In Central London and around London the iPhone 4 GPS fix is DIRE.

    What is causing this? It breaks all location based apps. Foursquare thinks I'm miles away. All the Cycle hire apps fail because they think I'm miles away.

    Yet the 3GS with iOS4 is fine.

    Service provider is Vodafone UK btw.
  21. rockjam macrumors newbie

    Nov 23, 2008
    In fact I'd point out that the screenshots above are from the and you can see where I am usually from the tower I am connected to (in red) but the blue dot should be near that and it's not.

    It's driving me crazy.
  22. Daveoc64 macrumors 601

    Jan 16, 2008
    Bristol, UK
    What about using the Maps application?

    I'm not sure, but I don't think that App uses GPS to help represent the location of the cell sites you're looking at.
  23. kolax macrumors G3

    Mar 20, 2007
    Find it great. I use Golfshot GPS all the time too - and get a signal fix really quickly and accurate.

    In town it is good too - far quicker than my old 3G.
  24. rockjam macrumors newbie

    Nov 23, 2008
    It's calling Google Maps and overlaying the cell towers over the top. Or it should do, it can't because location services is not working. If I open Google Maps then the blue dot is in exactly the same place..because that is in effect Google Maps anyway.

    Location services is not working in iOS4 on the iPhone 4. The 3GS right next to it works fine. So does my Jailbroken 3GS with iOS4.

    Here's a swerveball tho. When I got out of London, outside the M25 delimiter, the location services is accurate again. 100% accurate.

    Hence it might be a London issue. Or something.

    Someone clever please tell us the answer and maybe throw in the winning lottery numbers too. Ta.
  25. rockjam macrumors newbie

    Nov 23, 2008
    I'm in London, IP4, Vodafone and also exactly 1.5 miles away from myself. Are you Jailbroken?

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