Vixen
Penultimate Amazing
No. you made that up. there was no mandate at that time for automatic buoys.
Float Free does not mean automatic activation
Float Free means they were not fixed systems that were part of the ship's radio outfit.
It does not mean automatic activation.
Official documents and the actual testing say otherwise.
Do look up that SOLAS resolution of Nov 1991 which mandated it came into effect 1 Aug 1993. I don't care for your argument 'people take a long time to adopt new regulations', as both Commander Montonen and marine electronic navigations expert Asser Koivisto for the JAIC confirmed the specs of Estonia, and indeed, you can witness with your own eyes Rockwater, Dec 1994, video in which they collect the HRU from one of the buoys.
End of.