There are lots that you can make completely silent, Motorola being the top of the list. They work well on lakes or open flat ground. None of them work worth poop if there is any amount of bush or terrain in the way. You will be lucky to get half to 3/4s of a mile out of any radio in the bush. UHF marine type radios are a bit better but even they aren't great. You phone is a far better option, with location sharing turned on. You can text for easier than voice calling. If there is no cell service and you want reliable communication, Sat phones are the only real choice.
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