flyingbronco05
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Apple ITouch GPS Problem

Mon Dec 29, 2008 6:44 pm

I got the new Apple iTouch from my brother in law for Christmas. Everything works great except for part of the maps function. When I click the icon that says find current location, it locates me in Miami, FL even though I am 30 minutes north of Chicago. At my gf's place, it pins me in the southern part of Illinois. At my sisters condo in Chicago, it places me in Baltimore, MD. Any idea how to fix this? I've already read through the apple manuals and troubleshooting but nothing has mentioned it.

http://www.apple.com/ipodtouch/
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casinterest
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RE: Apple ITouch GPS Problem

Mon Dec 29, 2008 6:50 pm

The ipod Touch does not have a GPS in it like the Iphone,
so it is using your wifi network as a source of where you are. if the ISP is registered in another location than where you are, then you are going to show up where the IP address is registered.


My Iphone with GPS that I just got, works extremely well running the 2.2 software upgrade.
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flyingbronco05
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RE: Apple ITouch GPS Problem

Mon Dec 29, 2008 6:57 pm

Well we all have comcast internet, so why would mine show Miami, my sister's Baltimore, and my GF's southern IL?

Thanks for the insight though.
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RGElectra80
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RE: Apple ITouch GPS Problem

Mon Dec 29, 2008 8:02 pm



Quoting Flyingbronco05 (Reply 2):
Well we all have comcast internet, so why would mine show Miami, my sister's Baltimore, and my GF's southern IL?

Devices like the iPod Touch don't have a GPS transponder so it's pinning you down on a location based on your IP so what he's saying is if the IP of the wireless network your iPod Touch is picking up in northern Illinois is registered to an ISP in Miami, that's why it's showing Miami and so on.
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casinterest
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RE: Apple ITouch GPS Problem

Mon Dec 29, 2008 8:08 pm



Quoting RGElectra80 (Reply 3):
Devices like the iPod Touch don't have a GPS transponder so it's pinning you down on a location based on your IP so what he's saying is if the IP of the wireless network your iPod Touch is picking up in northern Illinois is registered to an ISP in Miami, that's why it's showing Miami and so on.

However , my guess is that as the Iphone and other phones that use google get intermixed, they will adapt the locations based on what other user's near you are reporting.
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flyingbronco05
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RE: Apple ITouch GPS Problem

Mon Dec 29, 2008 9:33 pm

Thanks for the insight. If the above is true, the maps portion is useless if it thinks I am in miami when I am in Chicago. Wonder how it'll work when I overnight on some of my airline trips.
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gocaps16
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RE: Apple ITouch GPS Problem

Tue Dec 30, 2008 12:18 am

Quoting Flyingbronco05 (Reply 2):
Well we all have comcast internet

That's your problem. Comcast sucks.

My Ipod touch works perfectly fine. All it is is google maps. I used the map feature while I was on vacation in Australia and it works like a charm.

[Edited 2008-12-29 16:19:32]
 
RGElectra80
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RE: Apple ITouch GPS Problem

Tue Dec 30, 2008 1:05 am



Quoting Flyingbronco05 (Reply 5):
Thanks for the insight. If the above is true, the maps portion is useless

Not at all. You can still browse the maps and get directions provided you have a wireless signal, just like you would if you were using Google Maps on your computer.
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Klaus
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RE: Apple ITouch GPS Problem

Tue Dec 30, 2008 1:32 am

Actually, the internet connection is not used by the iPod Touch to determine your location. It is only needed for access to Google Maps so it can give you a view of the place.

The location is pinpointed through the wireless IDs of WiFi access points within range. It would even work if none of them had actual internet access (except the one that lets you load the maps) since you normally won't be able to log in to most of them. But your iPod Touch can "see" their wireless IDs even without having access to their respective networks.

Apple has licensed the Skyhook technology for that purpose. It works through a registry of wireless access points with their respective locations. If the owners of the access points move to a different place it can affect the location service until the location is updated in the database. In my place it works perfectly, but especially in more rural areas it may not, or where there are only new access points which aren't registered yet.

The iPhone uses three ways to determine its position:
- WiFi (Skyhook)
- cell tower triangulation
- GPS

The iPod Touch only has the first option available:
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lincoln
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RE: Apple ITouch GPS Problem

Tue Dec 30, 2008 2:18 am



Quoting Klaus (Reply 8):
The location is pinpointed through the wireless IDs of WiFi access points within range. It would even work if none of them had actual internet access (except the one that lets you load the maps) since you normally won't be able to log in to most of them. But your iPod Touch can "see" their wireless IDs even without having access to their respective networks.

Just to add, the Skyhook architcture is (IIRC) suposed to be fault tolerant and self healing, and the "wireless IDs" isn't the ESSID (e.g. "my_wireless_network") but the BSSID (the MAC addresss of the AP for an infrastructure network) which also means that the ESSID doesn't even need to be broadcast for Skyhook to take an access point into consideration for determining your location. I thought I read somewhere that at least in the US, the Skyhook database was originally populated using a "drive by" method much like Google Street View -- and like Google Street View as businesses close/relocate and people move the landscape can change over time.

I have been somewhat suprised by how accurate it was especially in "very suburban"/borderline rural areas... but the best results will always be in stable urban areas where there are lots of wireless access points that don't move frequently (I would imagine that a college dorm or similar situation could be pure hell)
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