Russ Paielli wrote a mid-air collision simulating computer model 500 sq mi (1,300 km2) centered on Denver, Colorado.
The Altimeter-Compass Cruising Altitude Rule, attributed by Patlovany to "an uncredited Australian aviation safety pioneer" in 1928, proposes envisaging a north-up (i.e. fixed-rose) compass and an altimeter side-by-side; by selecting an altitude such that the large (100-ft) hand of the altimeter and the compass needle pointed in parallel, 100 feet of vertical separation would be provided for every 36 degrees of course offset.
The ACCAR alternative to the hemispherical cruising altitude rules, if adopted in 1997, could have eliminated the navigation paradox at all altitudes, and could have saved 342 lives in over 30 midair collisions (up to November 2006) since Patlovany's risk analysis proves that the current regulations increase the risk of a midair collision in direct proportion to pilot compliance.
The navigation paradox describes a midair collision safety system that by design cannot tolerate a single failure in human performance or electronic hardware.
Of the 342 deaths since 1997 so far caused by the lack of a linear cruising altitude rule (like ACCAR), only the head-on collision over the Amazon could have been prevented if either pilot had been flying an offset to the right of the airway centerline.