Even with all the signs and signals on the roads and motorways, all of us have at one time or another gotten lost whilst driving. It would be natural to imagine, therefore, that in the vast expanse of the sky it would be quite easy to get lost without any signals for guidance. However, the fact is that there are indeed signals up there to rely upon. Going back to the early days of aviation, it’s true that the intrepid pilots of the day did have to rely upon... keep reading