[pct-l] smartphone as GPS

[greg mushial]

> Message: 2
> Date: Mon, 25 Oct 2010 08:44:13 -0700
> From: Austin Williams <austinwilliams123 at gmail.com>
> Subject: Re: [pct-l] smartphone as GPS
> To: pct-l at backcountry.net
> Message-ID:
> <AANLkTinOvNfuQPZHGGwxJk2BCWN9RR=DTjKCx7wJ9yr6 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Be careful.  Most of the time the 'GPS' in smart phones is based on
> cell-tower triangulation, NOT gps-satellite triangulation.  That means 
> when
> there are now cell towers around, the "GPS" on the phone won't work.  Make
> sure you buy one that uses *real* gps, not the kind that uses cell tower
> triangulation.
>
> Just a heads up.
>
> -- 
> Austin Williams
>

Is there any (published) indication of accuracy difference? Seems that since 
generally towers don't jump around, they should be as good as satellites... 
no?
TheDuck