HF radio in its various forms would be great, but other than putting out a brief shout for help and a location, or a "I'm OK" I'm not sure I see much value in just staying in touch. Especially since the few HF transmitters I am familiar with soak up a lot of what, in this scenario, would be little or non-existent electrical power.

But I do see a huge value in having a decent HF (Shortwave) receiver. Invaluable in getting news and information from all over, and would would help you to understand the situation.

Note: I still have and cherish my 1970 vintage portable Zenith Trans-Oceanic multi-band shortwave receiver. Will operate on (multiple) D-cells or 110 volt AC.