Re: [Fed-Talk] IPAD
Re: [Fed-Talk] IPAD
- Subject: Re: [Fed-Talk] IPAD
- From: Dave Schroeder <email@hidden>
- Date: Sat, 30 Jan 2010 12:50:28 -0600
On Jan 30, 2010, at 12:46 PM, Dave Schroeder wrote:
> 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.
To be clear, when I say "it could take several minutes (instead of seconds) to acquire an accurate fix," that is in *absence* of any cell/Wi-Fi connectivity.
- Dave
> 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
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