"Even a dummy like me with no interest in learning the Morse codes knows the SOS code."
True, ... --- ...
But do you know the Morse for "Do not approach. We have drifted into a mine field"
TBH, I'd say one of the positives about teaching people Morse and to use the sextant would be showing them then when the tech fails they can still survive and function. More and more, and speaking as someone born at the junction between millennial and Generation X, people are becoming completely dependent on technology for everything... the Google effect. Take a smartphone away from a teenager these (ok and maybe me as well) and they go into immediate withdrawal. For that person knowing they can still update the local twitter equivalent via the signal light might just keep them sane.
"@USSYOU Power down LOL (Crying face) <STOP>, Send help <STOP>, Mind the Mines <stop> HASHTAG NAVYRULES"