On this job, I use road maps. Usually, once I go to a place, I either never have to go there again, or I know how to get there again.

Since all my directions tend to have something to do with RR tracks, any permanent markings would soon make the maps useless.

So I bought a purple pen from a fabric shop to mark where I'm going. The ink in this pen slowly fades away in about 48 hours (24 hrs in a humid environment). Then, when I need to use the map again, it's unmarked and I can start over.

Sue