As far as the DMR yes you will have to change code plugs for regions it’s pretty easy you can do that ahead of time but it will require a computer to program the radio you can have dozens of files programed for different regions. All of the linking systems Fusion, DMR, echolink, etc do require internet access because of the world wide linking. Fusion and DMR are two different modes and do not play well with others there are gadgets that can link them however.Yeah I guess with a dead internet you'll have to relay on the propagation gods with HF.
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