Earlier quoted context omitted.
Stop & Shop in the NE US released this in ~2006
I worked on that project (Shopping Buddy) and a few later iterations of it. This was before the iPad, we had these huge IBM super rugged tablets on the carriages. We used something like Zigbee to triangulate the precise location of the carriage in the aisle, so we could tell whether the cart was at the beginning, middle or end of aisle 5 or aisle 6 and target ads appropriate for where you were. There was a small scan…
My mother makes uses of it every week and gloats that we don't have the tech available here in Boulder (a tech hub).