Safety First - Always
Use this mirror placard to hang on your rear view mirror whenever you need to park and walk off to go find a cache. It not only lets the authorities know why your vehicle is there but also exactly where you will be in case of an emergency.
They are reusable and each one comes ready to travel with a dry erase marker so you can write the cache info on one side and your contact info on the other side. Once you're done, wipe it off and it's ready to hang up for the next cache.