Anyone who says it is impossible to get lost on the Camino, even the CF is incorrect. Many walkers over the years,on this site, have indicated that they got lost, or at least temporarily lost...having missed a marker or arrow and gone the wrong way on a trail or road. This happened to me once as well. Sometimes signs are obscured by overgrowth, missed due to poor visibility due to fog, darkness or snow/blizzard conditions, etc, or to the occasional pranksters changing the direction of a sign. If you are on a road or trail and get lost the easiest and usually safest thing to do is to retrace your steps. Try not to complicate the mistake by trying a short cut that might complicate your situation...unless you have been given explicit instructions by a local that you perceive as highly reliable. There is no harm carrying a small lightweight compass, if you know how to use it.