[OSM-talk] Good deal on Garmin GPS unit

[Nick Black]

On 7/6/06, Christopher Schmidt <crschmidt at crschmidt.net> wrote:
>
> On Thu, Jul 06, 2006 at 09:59:28AM +0100, Jon Stockill wrote:
> > Nick Black wrote:
> >
> > >RE GSM/Sirf II - I stand corrected!  I've emailed Sirf to see what they
> > >have to say about it, but it does seem to mean that the chips *can* be
> > >used with GSM signals.  I don't think that this is A-GPS though.
> >
> > ISTR there's a requirement in the USA for newer 3G phones to be able to
> > provide a position when an emergency call is made - this could be why
> > the manufacturers are pushing this chipset, since it actually has a
> > chance of being able to provide a fix while indoors. When used in this
> > way it's not unreasonable to assume that the GSM cell data will be used
> > to help with GPS positioning.
>
> As far as I know, the requirements for location are only triangulation
> based, under the E911 legislation, and have been completed for several
> years.


E911 legislation originally required that from October 2001, all wireless
service providers in the USA should be able to locate a user with an
accuracy of 100m in 67% of cases and 300m for 95% of cases.  The method used
was not specified - triangulation, dead-reckoning, GNSS etc were all good.
A-GPS (GPS reception augmented by correction signals broadcast via GSM
towers) emerged as the front runner.

Chris: Has this now been implemented in the US?  Six months ago it was going
to be six months until the E112 legislation came into force and we all had
A-GPS enabled cell phones in Europe.  Very little sign so far...

 Nick

--
> Christopher Schmidt
> Web Developer
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