I wonder if a tape that could be stretched out on the trees would be a good idea. Rescuers then would only have to come across something hundreds of yards wide (with a message printed on it saying 'I am this way >', instead of the one square foot you are stood on. Does such a tape exist?
qjs
biodegradable forestry flagging tape here:
flagging and prior to use, one could use a marker pen to write on the tape a name, date or.....