AVR-Chat

On Oct 26, 2007, at 1:33 PM, stevech@san.rr.com wrote:

> there are many products and service providers in this field now. I  
> work in that field. GPS is rarely used due to no-sky-visibility,  
> high cost, battery life. The more popular techniques are bar codes  
> and RFID readers at choke points and portals. The location of the   
> conveyance (truck, rail, container ship) is known, and other  
> systems know what item is on what conveyance.  The shipping  
> industry is doing these services for premium rates, for perishables  
> like lobsters and high value cargo. Mostly in southeast asian ports  
> and places where employee crime is high.

I occasionally ride streetbikes with these guys who use properties of  
near field RF to measure range: http://www.q-track.com/

--
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.