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Carry a whistle, preferably one that produces at least 100 decibels. If you get lost or injured, stay put (unless you are in imminent danger) and use the whistle to signal for help.
It's probably one of the cheapest, lightest but most overlooked pieces of kit to carry. Doesn't require ammo, batteries or a signal to work.
>t. former /out/fitter and rafting guide