Thank you for all the links. The spotigo will work for trade shows.
The picture I had was a bit different but would net the same result.
It was two wi-mesh tropos like radios and a floor map.  The radio
signals provide two possible locations and a local app uses history,
velocity and geometry (walls and aisles) to pick the right one.

The use case is: a pedestrian able locate the person or object they
are looking for to within a meter - consider finding a child at a
crowded public event.

That is a pretty general use case with an extremely important example
attached to it.

Oh, and I want it to be less expensive than GPS.

On Jul 9, 2:45 am, whitemice <[EMAIL PROTECTED]> wrote:
> Having an accelerometer on a chip is a great idea.  They are cheap,
> accurate and available on more and more 
> phones:http://www.dimensionengineering.com/accelerometers.htm
> The problem is that you are trying to use them for inertial
> navigation, which is inherently complex, requires both orientation and
> acceleration sensing and some sort of position initialisation.  Don’t
> forget that mobile software developers have to make do with *standard*
> hardware.http://en.wikipedia.org/wiki/Inertial_navigation_system
> I see that you are clutching at straws, trying to make your use case
> work.  To that end, have you considered investigating Wi-Fi based
> positioning?http://www.spotigo.com/products-and-services/spotigo-wifi-based-posit...
> Bluetooth can also be useful, but I won’t comment on that until I have
> been allowed to play with the actual Android API. ;-)
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