I should work on my compass skills.
I've made minor navigation errors but no major ones. The most notable was missing a junction that cost me like a tenth of a mile and a couple hundred feet elevation, so not bad. I had to stop and look at a map, because there should not have been a trail junction there. It didn't make sense in my head at all. Brains get fuzzy when fatigued. I feel it in myself running, too.
Maybe my proudest moment was turning back when I wasn't sure I could navigate above the tree line on one summit. I knew my limit. It was hard, but it was right. Two people spent two unplanned nights on that summit last winter.