Third Epoch: 1929-1938 Years of economic depression, airline starts, war preparations.

Herein, in spite of low military budgets, aircraft capabilities were enhanced, most requiring a flight navigator. The B-12, B-17, B-24, B-25, B-26, and B-29 would all require well-trained specialists, i.e., navigators and bombardiers. Good nav-methodologies for the bubble-sextant with an averager and the trained employment of celestial navigation methods such as the Air Almanac with Sight Reduction Tables allowed for dependable worldwide Navigator flight navigation. Navigator Harold Gatty at the urging of the US Army's pioneer navigator Capt. Hegenberger in 1932 taught the Army Air Corps Experimental Unit at Bolling Field in Washington, D.C. precision Dead Reckoning. Gyro-assisted compass systems, Norden integrated-autopilot bombsights and optics-gyrostabilized driftmeters came in to being. And too the capabilities of radar were discovered. Precision plotters notably Weems, dividers, accurate maps and celestial tables with a bubble-sextant became the navigator's basic trade tools. The Army Air Corps developed some eight planes during this time.

Navigator developments in this period:

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