and incident electromagnetic radiation and a transmitter coupled to the sensor suite for communicating logistical information in response to the logistical prompts application_number US 201314078924 A description in the following description an embodiment of a unit loading device uld tag for automatic track and trace of unit loading devices and pallets is provided turning now to fig1 there is shown the form factor of the unit loading device uld tag 100 and corresponding c slot 110 according to the invention the uld tag 100 is designed to fit into the c slot 110 of the outer rail 120 of a pallet or uld note that a conventional outer rail 120 is slightly modified to permit the insertion of the tag into the slot fig1 shows the placement of the tag in the slot with the modifications described the top part covering three position slots are removed or milled off to permit positioning of the uld tag 100 in the c slot 110 the integrity of the outer rail 120 is not compromised as the channel remains intact a 1 0 mm slot is milled on the leading edge of the preferably aluminum c slot 110 to permit electro magnetic leakage the uld tag 100 dimensions are such that the tag fits into the channel and is protected by the walls of the channel the tag is potted in an epoxy resin for additional protection a film with insulator properties may be preferably applied to the top side of the rail in the area of the uld tag 100 to prevent electrical connection in that area when ulds or pallets are stacked one on top of the other fig2 shows the uld tag 100 in orthogonal projection fig3 is a schematic diagram.