Yeah, but "dux" ..... not everyone has a cellphone, and not all cellphones work "everywhere" you go.

I'd prefer a "flag" over the "Need Help" boat cushions, air horns, or flare guns ... but, wondering about how someone (alone) would be able to raise the flag, and "on what", to get the attention of anyone in the immediate area.

Seeing as how it's not a mandatory requirement piece of equipment, but just a "suggested" & available one, I see no intrusion by gov'mnt.

... cp