What is the impact of software on the accuracy of a cell phone propagation map?

A propagation map is but a colourful manifestation of the prediction made by the software as to the area of a tower’s coverage. It is not representative of the actual coverage area for any one cell phone call or message made or received at a particular time because it is not deterministic; it is, simply, a depiction of the general area within which a cell phone would be expected to connect to a specific tower: Cell phone propagation maps do not establish precise locations from which calls have been made, only the general area from which the call originated. The maps are not 100 percent accurate, rather “guesstimates” place their accuracy at between 60 and 80 percent, or possibly even lower. Said in another way, the rate of error may be 40 percent or more. (R v. Cyr, supra, at para. 88)