I used to always carry a compass in my bag of essentials. Because that bag generally remained buried in my pack, I never used my compass.
Then, early last winter, I was backcountry skiing with a couple of friends. One of said friends was showing the second friend and me an area that he had begun to explore.
As the day began to disappear, he consulted his GPS to lead us to the run that would take us back to our cars. The direction seemed utterly wrong to me, but my compass was in my pack, and my friend had his GPS with marked waypoints, so I withheld my suspicions.
Finally, I whispered my misgivings to the second friend. He shared them and asked if I had a compass handy. So I stopped and dug mine out.
We were headed in almost exactly the opposite direction as needed. It took some pursuading--the first friend was too married to his GPS--but we finally followed the compass and arrived at the parking lot before dark. It turns out that the first friend didn't have his GPS zoomed in enough or something like that.
Since that afternoon, I always keep my compass in my pocket. I don't often consult it, but at least now, I'll not suffer misgivings very long.