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For many soils, the information obtained from such a small sample describes the pedon from which it is taken with few omissions. Tap a localizer beam to select it and tune your radios or set up an approach. Much the same kind of problem exists in some deeply weathered soils in which the deepest material penetrated by roots is very similar to the weathered material at much greater depth. Where hard rocks or other strongly contrasting materials lie near enough to the surface to affect the behavior of the soil, their depths need to be measured accurately. Descent rates faster than this cause discomfort on the occupants which is felt in passengers’ ears. This will also automatically set the OBS for the approach.