NEXUS ONE GPS accuracySupport


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  1. jfbaro

    jfbaro Well-Known Member This Topic's Starter

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    Hi,

    I have been using my N1 for a few days now and the GPS accuracy is really wrong, about 500m out of the right position. I know GPS is not really precise, but 500m is far too much.

    I am seeing this behaviour when on WI-FI, haven't test through 3G/edge yet though.

    I haven't installed any ROM.

    Any suggestion?

    Cheers
     

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  2. inspiron41

    inspiron41 Well-Known Member

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    you just answer your problem. You're using wifi to determine your position and that's why it's so far. It's nearly pin point accurate when you use 3G.
     
  3. AnotherFatalEpic

    AnotherFatalEpic Well-Known Member

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    I've never used wifi but with 3G, the Nexus has many times pinpointed my exact address.
     
  4. mi_canuck

    mi_canuck Well-Known Member

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    mine gets super accurate as long as I don't have a bunch of crap above me (like in a big building, or a lot of metal above... ie. a car... it's not all that accurate when inside the car... but overall, i'm pretty impressed with the accuracy... better than the iphone 3GS i had...
     
  5. Teknologic

    Teknologic Well-Known Member

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    For the heck of it I tested this on both GSM(2G) and WCDMA(3G).
    3G was spot-on within 10 seconds. 2G started at about 60m away and located me in about half a minute, jittering around my location a bit from 5-10m
     
  6. MartinS

    MartinS Well-Known Member

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    So, nothing to do with GPS accuracy then... which is also fine by the way. The N1 and Copilot have replaced my stand alone tomtom.
     
  7. theartfullodger

    theartfullodger Well-Known Member

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    Several apps give you more info on GPS - eg "GPS Test" & "GPS Status" with such info. as which of the 30 GPS satellites the HW/SW/N1 can "see", accuracy of the position given, altitude (albeit the altitude can be incorrect as the earth is not round... ).

    So,,, as indicated above if the beast can't "see" that many satellites for that long then the GPS subsystem may report inaccurately, and if GPS can't find any fix the beast will revert to positioning from the Network provider's masts ..-.. so that I get in my normal home an inaccuracy of about 600mtrs if I turn GPS off..but in other places (with closer-spaced masts) you might get a better accuracy...

    If you want more info see wrongipedia at
    Global Positioning System - Wikipedia, the free encyclopedia

    Incidentally the N1 GPS system is way-way faster in getting a fix and much better at seeing through buildings than the two Garmin hand-held GPS's I've had (starting 1997-ish), so, nice job Google/HTC!

    Cheers!

    Lodger
     
  8. dhevans

    dhevans Well-Known Member

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    Just to add I've been amazed how quickly mine fixes, presumably using A-GPS? Still, out in the open, it's usually got a fix in less than 5 seconds and pretty quickly I have an inaccuracy of 7-10ft..
     
  9. chaz_uk

    chaz_uk Well-Known Member

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    Mine has been flawless using the Orange Maps app in the UK.
    It's a brilliant little performer usng AGPS IMO.
     
  10. Rusty

    Rusty Well-Known Member

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    I have very fast, very accurate positioning... puts my old N95 to shame. Severely.
     
  11. dhevans

    dhevans Well-Known Member

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    .. as well as fixing quicker than friend's iPhone 3Gs it is consistently more accurate - every time...
     
  12. chaz_uk

    chaz_uk Well-Known Member

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    That takes me back.... We used to drive for around 15 mins before the old N95 got a fix on the GPS satellites. :D

    I still think the N95 was one of the best phones ever tho. Fantastic little handset.
     
  13. reddragon72

    reddragon72 Well-Known Member

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    Ok let me throw this in there so you all understand something about GPS and AGPS. On my old Tilt it could take me up to 5 min sometimes to get a fix. this is due to the fact that it was a GPS phone, which means it doesn't get any "data" from the cell towers. I could load up programs that downloaded data from the internet and then injects it into the GPS driver to help the GPS receiver find the satellites quicker.

    Now with AGPS the GPS device on the phone will poll the towers around you to get the very same data that the program I had loaded on my old phone delivered. This will allow the phones GPS to lock onto the towers faster as the GPS now knows where to look for the sats. Each tower is loaded with it's own data depending on it's location, this allows a very small amount of info to be transmitted since the GPS only needs info for the current location.

    Now turn off your GPS on your phone and you are now running "triangulation PS" or TPS. All this does is use two items from each tower around you. The towers tell the phone their GPS positions so the phone can find that on a map and then use a signal calculation table built into the tower to figure out the approximate distance to the tower depending on how strong the signal is. The more towers that report to the phone the more accurate your position, BUT this method is extremely unreliable for exact positions cause there are so many factors that can mess with the signal. There are objects blocking signals/reducing signals and also bouncing signals. Also sun spots and atmospheric conditions can cause issues, including rain, fog, and yes heat radiation from objects around you. So as you can see without GPS on the TPS is very inaccurate, but you will know the general area that you are in.

    Now add WIFI to that and the map program you are using will had an online database to poll local WIFI hotspots, but this is so unreliable and extremely unreliable that you should never use it, instead climb on top of a build and use google maps to try and find your location :) but don't fall and if you do, then I'm not responsible.

    there that is a basic dumbed down version of how it all works. Hope that helps.

    Also I geocache all the time and have found that my Nexus One is more accurate then my old Tilt, and also my old Tilt didn't like to update once I stopped. But my Nexus One gets me withing 7 feet in the woods!! I have found more caches with my N1 then I ever could with my old Tilt.
     
  14. Flaring Afro

    Flaring Afro Well-Known Member

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    Why would you even use gps where you have wifi? :confused:
     
  15. dhevans

    dhevans Well-Known Member

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    I've just started geocaching and there have been several we would have taken longer to find if we'd relied on my mate's iPhone - one where the thing was in the root of one tree of many in a row for example..
     
  16. Rusty

    Rusty Well-Known Member

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    Why would you use a car if you've got a cheese burger?

    That makes the same amount of sense as what you posted!
     
  17. EskimoPie

    EskimoPie Member

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    I've been geocaching with mine too using GeoBeagle and been very pleased with the GPS accuracy. Under 10 feet most of the time. That combined with the built in compass make the N1 a geocaching monster.
     
  18. EskimoPie

    EskimoPie Member

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    You obviously have no clue what GPS is. GPS stands for Global Positioning Service, and is used to determine your precise location within a few feet. WiFi is a networking protocol with is often used to access the internet... literally nothing to do with each other.
     
  19. Flaring Afro

    Flaring Afro Well-Known Member

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    I was asking what use would it have? It's useful in a car for directions or if hiking etc but why would anyone use it in their home or starbucks etc.

    EDIT: I might have misread it and thought that when loading maps via wifi they were displaying the position wrong. I am assuming the N1 does not have maps saved onto it but loads maps from google as you go like some carputers.
     
  20. batman25

    batman25 Well-Known Member

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    The gps is very accurate. It will usually pinpoint where I am in my house.
     
  21. EskimoPie

    EskimoPie Member

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    You make a good point, I apologize for my snide remark. There are still some location aware uses however like Google Buzz which require more accurate positioning than networks alone can provide. Say for instance you wanted to post a Buzz that you're in that particular starbucks?
     
  22. mi_canuck

    mi_canuck Well-Known Member

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    exactly... i use it a lot for that, and also with latitude to locate friends and be located... certainly not essential, but cool feature nonetheless...
     
  23. theartfullodger

    theartfullodger Well-Known Member

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    I agree: Mind you, when I need to look at my 'phone's GPS to figure out where I am in my house I'll probably call the Doctor....

    Cheers!

    Lodger
     
  24. Soupdragon

    Soupdragon Well-Known Member

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    Hiking -. Husband & maps - 0, lovely phone 1. QED!!. Starbucks???, wtf, live a little!!!
     
  25. jfbaro

    jfbaro Well-Known Member This Topic's Starter

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    Thanks guys for the answers! Much appreciated ;)
     

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