Re: [Fed-Talk] IPAD
Re: [Fed-Talk] IPAD
- Subject: Re: [Fed-Talk] IPAD
- From: Dave Schroeder <email@hidden>
- Date: Sat, 30 Jan 2010 12:46:02 -0600
No, Assisted GPS (A-GPS) *is* satellite GPS. It just also uses triangulation with cell towers and wireless access points in addition. It can acquire a GPS fix without any cellular network or Wi-Fi connectivity, but because it is not optimized for that in the same way that a dedicated handheld GPS receiver (and its antenna) is, it could take several minutes (instead of seconds) to acquire an accurate fix.
Once it acquires and maintains a fix -- in either assisted or standalone mode -- it's just as accurate as any dedicated consumer GPS receiver. This is the same case for the iPhone 3G/3GS. The iPhone "2G" does have location services, but only via cell network and Wi-Fi triangulation, and the iPod touch only via Wi-Fi. (Wi-Fi triangulation services are provided by Skyhook Wireless.)
- Dave
On Jan 30, 2010, at 11:16 AM, Joel Esler wrote:
> Okay, so it doesn't have "satellite" gps. It has agps, which is triangulation using cell towers, and triangulation using wireless access points.
>
> --
> Joel Esler
>
> On Jan 30, 2010, at 10:00 AM, "C. A. Norton" <email@hidden> wrote:
>
>> Location
>> • Wi-Fi
>> • Digital compass
>> • Assisted GPS (Wi-Fi + 3G model)
>> • Cellular (Wi-Fi + 3G model)
>>
>> On Jan 28, 2010, at 11:15 AM, Todd Heberlein wrote:
>>
>>>
>>> On Jan 28, 2010, at 8:07 AM, Joel Esler wrote:
>>>
>>>> I don't know if the ipad has gps. Is it on the specs website?
>>>
>>> http://www.apple.com/ipad/specs/
>>>
>>> It looks like it has 4 location best technologies, but two of them are only in the 3G models
>>>
>>>> Wi-Fi
>>>> Digital compass
>>>> Assisted GPS (Wi-Fi + 3G model)
>>>> Cellular (Wi-Fi + 3G model)
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