SOLAS Question

Has anyone ever used the Life Saving signals as per Solas card 2?

Is it advisable to fire a star shell in the vicinity of an aircraft? I know these only rise to about 65m but surely this would ruin any pilot’s nite vision especially if wearing nite vision gear?

Also why is there a difference between the ICAO symbol for Require Medical Assistance “X” and the more familiar international code "W"
Similarly, why ICAO “Y” for yes and the international code “C”

Puzzles me.

how bout the signals for use with a breeches buoy?

Probably haven’t been used since USLSS surfmen rolled out the Lyle guns…

Id be curious to know the last time the breaches buoy was used to rescue someone.