SF, flagging tape with sharpie is a great idea, I never thought of that!
You can get some Boa radios for dirt cheap on ebay, if there not water proof they can be stored in a freezer zip lock bag. I think for $30 you can have two, and there 1000% better than radios that Walmart sell.
Main thing about the flagging tape, it needs to be communicated with the separating party for them to BOLO for it in the event of an emergency, might be good to have 2 markers so they can have a kit too...
EB
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