You dismiss the maritime expert skills of Asser Koivisto who presented to the JAIC in 1995 how the Estonia Kannad 406F EPIRB's worked.
Here in Finland we have once a year what is called 'Jealousy Day' because despite the usual tight privacy laws, once a year the government's Tax Office releases the details of every taxpayer and how much tax they earned. This gives people the opportunity to see how much better paid everybody else seems to be, which, of course, is an illusion because papers tend to concentrate on the top 5% or so. Anyway, here is Asser Koivisto's public domain tax return of the Year 2021, as per the Tax Office:
https://verokone.hs.fi/henkilo/1950Koivisto Asser Joel
Do you really think this is a fool talking? So you can either opt for the word of someone who supplies the Finnish Navy with maritime surveillance systems or you can rely on a random person on the internet on an obscure forum who says he recently bought an EPIRB for his boat.