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They can put Sat Navs on cotton to aid been threaded through a needles eye.
I may be wrong, but I don't think satnav is yet accurate enough to pinpoint individual isles. What some large stores use is their own in-house nav system using microwave signals that a device on the trolly triangulates. That's been around for a few years.
Hmmm... how about fitting them to the brats so we know if they really are in bed?