Before GPS: How Did Pilots Navigate in the Early Days of Aviation?

Navigation is something we do every day without even considering it. In its simplest terms, navigation is getting from point A to point B. It's fairly easy when the distances are short, and the environs are obvious. Finding your way to the kitchen in your own home, for example. But when the distances grow longer, and if the destination is unfamiliar, then the challenges increase. (aeroxplorer.com) More...