While teaching flying, Ocker became more acutely aware of the hazards of flying into clouds, which invariably disoriented pilots. He began carrying one of the first turn and bank indicators, given him by Sperry during their earlier testing. Working with US Army Captain David A. Myers, a flight surgeon at Crissy Field, California, they developed proof of that instrument's trustworthiness and ability to deliver an airplane out of blind-flight conditions, provided the pilot could be convinced to obey its indications rather than his own senses.