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  Increased navigational accuracy can place several aircraft on the same course in the same lateral position Strategic lateral offset procedure (SLOP) is a solution to a byproduct of increased navigation accuracy in aircraft. Because most now use GPS, aircraft track flight routes with extremely high accuracy. As a result, if an error in height occurs, there is a much higher chance of collision. SLOP allows aircraft to offset the centreline of an airway or flight route by a small amount, normally to the right, so that collision with opposite direction aircraft becomes unlikely. In the North Atlantic Region pilots are expected to fly along the oceanic track center-line or 1 or 2 nautical miles to its right, randomly choosing one of these three offsets on each entry to oceanic airspace. The aim is to not achieve an overall even distribution of one-third of all flights on each of the three possible tracks, as one might assume. When the procedure was originally developed, 4.9 percent of aircraft in most oceans cou