Everybody needed a navigator then. Unless you were flying in circles. Remember commercial planes had navigators until the 70s.
An older friend was one of the early 747 pilots. He used to smoke, and said he would open the sextant hole in the top of the back of the cockpit and have a cigarette, blowing the smoke out of the hole.
The point being, a plane as relatively modern as the 747 was set up for navigation by sextant.