As far as I know you still cannot register a PLB with the MCA, but always worth calling them. If with UK, as below:
http://www.dft.gov.uk/mca/mcga07-home/emergencyresponse/mcga-searchandrescue/epirb/mcga-sar-epirb-online.htmNew Registration (ticked)
Name of vessel:
fill in yours!Type of vessel:
select pleasureMax Number of people carried:
fill in yours and be accurateMMSI and Call Sign if you have
Beacon Manufacturers Name:
Beacon Type:
Beacon Serial Number (From the label on the beacon):
Hex ID (15 characters eg: 9D0... or 1D... etc): (15 hexadecimal digital so A-F and 0-9)
Personal Details:
Enter appropriately, ensure you put MALTA in the address, ensure you have +356 before your telephone numbers, list multiple 24 hour contacts
Notes: here I put some details of my boat, its engines and where i normally operate.