On Thu, Jul 1, 2010 at 7:40 AM, alan smith wrote: > Curious if anyone knows for ocean container tracking, obviously they use = a GPS module to get the location, but for transmitting data back to the "ho= me" monitoring station, I would assume that a single satellite transmitter = collects data via wifi or some other network from each GPS unit? =A0I can't= imagine any other way of it working. =A0Anyone have knowledge on this? William Gibson may be able to answer that for you. One of his newer books involves this stuff: http://www.williamgibsonbooks.com/books/spook.asp :) -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist