The whole thing worked because people just weren't in a hurry the way we are now. You'd plan your route the night before, maybe call ahead to get directions from whoever you were visiting, and basically accept that you might take a wrong turn or two. Gas station attendants were actually super helpful too - like, you'd just ask them how to get somewhere and they'd give you turn-by-turn directions. It was slower but it worked fine for most trips.
What's wild is that people who did this regularly just memorized routes. Traveling salesmen, long-haul drivers, anyone who drove the same highways constantly - they knew the roads in their bones. Your grandfather probably still has that mental map for places he's driven to multiple times, which is honestly why he might stick with the atlas for familiar territory. There's something to be said for not relying on a screen, especially if you know where you're going 🍄
The real chaos was road trips to completely new places, and yeah, people definitely got lost more often. But GPS kind of spoiled us into thinking getting lost is the worst thing that could happen. Back then it was just... an adventure, sometimes a frustrating one, but you'd figure it out or turn around. Your phone battery also won't die on you mid-route, which wasn't guaranteed with the old system either 😅