First signal mirror save (that I know of) in 2024!

Will Fransen of New Zealand fell overboard 35km east of New Zealand on January 2, 2024.

He had to tread water for 23 hours before he was able to attract the attention of
three passing fishermen ~600 meters distant by
reflecting sunlight from the face of his wristwatch.


Global News: Fisherman saved by watch reflection [Archived Link]

New Zealand Herald: "Will Fransen, ordeal" [Archived article]
A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)