It wasn't just dead reckoning - they had RDF (radio direction finder) since the 30s, and dedicated navigators / radio operators on board. But even without radi

It wasn't just dead reckoning - they had RDF (radio direction finder) since the 30s, and dedicated navigators / radio operators on board. But even without radio, why is it terrifying? Navigating by dead reckoning is pretty straight forward in good weather. Edit: they also used celestial navigation. Many planes (until the 60s?) had astrodomes for the navigators.