A pivoting boot is disclosed for attachment to the unloading auger tube of combine harvesters, and serves as both a grain saving dam against unwanted grain spillage, and a directable spout. Each of the marks has one of different characteristic values each corresponding to a combination of a quantized first code for indicating a position in the first direction and a quantized second code for indicating a position in the second direction, the number of the different characteristic values being smaller than the number of the combinations. The first guiding portion faces the nail feeding passage, and the first guiding portion is rotatively disposed and arranged to separate one of the rows of the connected nails from the others. In other aspects of the subject disclosure, a PLMN ID reserved for HNBs is provided comprising multiple region IDs.