I have read some italian websites for you and this is what I understood:
Boats with the CE (European Certification
for the navigation) has to do the first audit after 8 years and then every 5 years.
Here are some certification
- R.I.N.A. : www.rina.org
- Istituto Giordano: www.certificazionenautica.it
- D.N.V.: www.dnv.it
- A.N.C.C.P.: www.anccp.it
- Udicer/Nautitest: www.udicer.it
- Quality & Security
RINA is the most commonly used by boat owners.
You can try to write to them in english
Maybe they will answer even if they don't have an english website.
According to some info found on a local sailing forum, it's enough that you call them to take an appointment.
Then they will send an officer to the port where you want to do the audit.
The boat must be out of water
The cost of the audit is about 300 Euros.
Then they write a document where they declare if your boat is compliant or not, and in case what you have to fix to achieve compliance.