Leave a note for someone or keep notes of certain activities with a waterproof pen and paper. Consider journaling or doodling to keep busy.
The waterproof aspect means the paper will hold up in the elements.
In C.E.R.T training they teach that communication with others is a key component to survival. Leaving notes and organizational symbols is key. First aid pros will say the same thing about tracking people who are sick or injured.
Keeping waterproof paper and pens handy is the solution.
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