Back Country Access BCA Link for FRS/GMRS radios (buy from a US company). These have a weather proof handset with a channel preset dial, volume control / power switch and socket for a headset and a main radio unit you can stash in the top of your pack. v1 units seem to be a little more rugged than v2 (camo units 35% off at backcountry.com right now). Have used these extensively in the mountains here in the US and the Andes and never missed a beat. Commended. To echo what others have said: perform radio checks with the rest of your party before separating and (even with non-licensed radios) learn and practice proper communication protocol. For S-really-HTF scenarios, radio legalities will be the least of your worries - use a marine VHF
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