POS is used as a planning tool. Here the segment POS is the product of the predicted POD and the current POA for that segment and therefore is the probability that, in a future search, a subject will be found in a given segment by a given resource. The POS for a segment really only has value in prediction. This expression is used in at least two different contexts, neither of which are likely to cause confusion. They are included here for completeness.
ROW is used to describe the area outside the existing search area.
ROW is used to refer to the current POA for the area outside the existing search area.