I remembered something else I take that I’d totally forgotten that a few others mentioned: a compass.
I used to also take a topographical map of the area, but these days I tend to depend on my watch (which can drop waypoints and a breadcrumb map) and my phone. But I keep a compass in my survival pack.
Why? Because worst-case scenario is that the batteries in your electronics die. A compass will always work.
The compass doesn’t have to be for finding your way on a map — when you reach the trailhead, turn around and try to find something you’ll be able to see from a distance. Take a compass reading to see what direction it’s in. Then do the same if you ever leave the trail and when setting up camp. This will help you figure out the relative orientation of the land, so if you end up lost, you can pull out the compass and use it to find your way back, even if you can’t see the landmark, instead of wandering in circles.
Useful to practice with it somewhere familiar before using it in the wild too.