Lubber terminology.

The title of Master Mariner will never be used by the USCG.

You will never see it on any legal documents.

Here is every master licences and the skills required to sit for the
licences. Note you will not find a Master Mariners Ticket.

http://www.mmts.com/licens.htm#MASTER_LIMITED.

No one has proven the term is proper anywhere except in the yacht club
steamroom.

Joe