How Did Bombers Find Their Way? Navigation in World War II

In a world before GPS and predecessor technology, how in the world did fleets of Allied bombers make their way across vast distances, hit their targets, and return home? Tonight, we talk about how navigation worked in World War II from experts who’ve studied it and one who lived it.

John “Lucky” Luckadoo of 100th BG fame will share what he learned in navigation training, and host Glenn Flickinger will walk through WWII 100th BG navigator Harry Crosby’s book on the subject, A Wing and a Prayer, with Mike Faley, 100th BG Historian and Rebecca Hutchinson, Harry’s daughter. Our own Bob Von Bargen, a retired Air Force navigator, will also guide us through the discussion.

During World War II, with no digital technology to assist them, USAAF navigators relied on complex skills, advanced training, and specialized equipment to complete their missions accurately and under high pressure. Their methods included a mix of dead reckoning, celestial navigation, and radio navigation—each with its own strengths and limitations. Given the severe consequences of navigation errors in combat, navigators trained rigorously to master these techniques, learning to adapt on the fly to conditions that constantly shifted with the demands of war.

Dead reckoning was the most basic and fundamental method navigators used. It involved estimating the plane’s position by calculating the time spent flying at a particular speed and direction. Armed with a stopwatch and a map, navigators would start with a known location and calculate the aircraft’s position based on its heading and airspeed. Crosswinds could throw the aircraft off course so navigators would check their position against landmarks or other data whenever possible. Often, vast stretches of ocean made this cross checking impossible.

In such cases, navigators turned to celestial navigation. This complex process involved using a sextant to measure the angle between a celestial body—such as a star, the sun, or the moon—and the horizon. By comparing these measurements with special navigation tables, navigators could establish the plane’s position on the Earth. This technique required both clear skies and precise trigonometric calculations, making it challenging under combat conditions where visibility was often poor. Still, celestial navigation was one of the most accurate methods available at the time, and mastering it was essential for any navigator.

Radio navigation provided another layer of support. Using ground-based radio stations, navigators would tune into specific frequencies and use the Radio Direction Finder (RDF) to home in on the radio signals. By comparing the signals from multiple stations, they could triangulate their position relative to these points. Although valuable, radio navigation came with its own set of issues, including limited range and the risk of interference from enemy jamming.

Training to become a navigator was intensive and required a wide array of skills. Navigators learned the fundamentals of math, geography, meteorology, and mechanics. Celestial navigation, in particular, demanded precise handling of a sextant and fast calculations, as split-second decisions were often needed under pressure. Training missions would frequently simulate the intense conditions of combat, including flights at night or in adverse weather, to prepare navigators for what they would experience in the field. Familiarity with the aircraft itself was also important, as navigators occasionally needed to take over basic flight controls in an emergency.

The navigators relied on a variety of specialized equipment to perform their duties. A standard kit included the sextant for celestial navigation, a drift meter to measure crosswind angles, and a Radio Direction Finder for picking up radio beacons. Maps, rulers, compasses, and protractors also occupied the navigator’s station.

Only after World War II did Inertial Navigation Systems (INS), and, later, the Global Positioning System (GPS) come online. INS used internal sensors to calculate position changes, eliminating the need for constant external references. GPS revolutionized the field entirely, providing precise, real-time global positioning and essentially removing the need for manual calculation. These technologies have streamlined aerial navigation, making it safer and vastly more efficient than the methods WWII navigators had to master.

We’re grateful to UPMC for Life and Tobacco Free Adagio Health for sponsoring this event!