Assuming I am lost with minimal tools, but have my knife, is there any way to improvise a knife sharpener in the woods?
You can use a fine sandstone with a little water on it. Sandstone works the best because of its fine grain and good abrasive quality. Using water smooths the sandstone surface.
- Drag the stone slightly diagonal away from the edge on one side
- Change the side with each stroke
- Check the sharpness with your thumbnail once a while
If you can't find sandstone you could also use another fine grained stone as a fallback.