Beware
The Dutch at the moment appear not to be accepting PLB's, they are currently asking for an ELT encoded with the 24 bit a/c address.
Discussion is ongoing
here.
Can't say I agree with their argument about wanting the a/c details. If I end up in the drink I'm still going to need rescuing whether I got there by air or by sea, and if it's a PLB it's unlikely that I got there because I was in a large airliner or ship that has sunk without anyone being aware of it. My details are registered at both the MRCC and ARCC and they have the contact info that will enable them to find out what I was doing.