The development of ground proximity warning systems (GPWS) and, later, enhanced ground proximity (EGPWS) have arguably saved thousands of lives and relegated controlled flight into terrain in turbine airplanes (once the primary cause of transport-category accidents) to rare occurrences. GPWS (commonly known simply as “ground prox”) warns pilots of high terrain. Enhanced ground prox takes the technology further by predicting upcoming conflicts and warning pilots about them. All of today’s terrain awareness systems are the descendants of Bateman’s work. In addition to his work helping us avoid undesired encounters with terrain, Bateman also was key in developing wind shear detection systems by using Doppler radar to detect sudden, dramatic changes in wind speed or direction and warn the pilots of the hazard.