I'm not trying to be dramatic. I am just pointing out the logical extensions of the thinking. For example, I am remembering watching a scuba instructor working with students in Ste. Maarten in the Caribbean. Would there be an office of the overseeing organization on that island, or would his students have to go to another island or a mainland site in order to be certified? Ste. Maarten has two sides, a Dutch side and a French side. What would happen if the supervising organization were headquartered on the Dutch side and the French side refused to accept its authority?
That last one is a very serious question because of something that happened in my own experience.
The PADI Student Record File (SRF) has an enormous number of places for the instructor to initial individual portions of the student experience and sign larger sections. They also have to put in their PADI numbers for every skill. This allows for situations in which different instructors certify different portions of the student's performance. All of this is repeated in the student's logbook. This leads to painful writer's cramp for the instructor finishing up a class. To ease that pain, PADI made it clear that if one instructor was responsible for all the skills in a section (like all the pool sessions), then the individual initials, instructor number, etc. next to each individual item were not necessary--the signature at the end would do.
At the dive shop were I was working, one of our students took that form as a referral (standard practice) to a PADI dive shop on a French Caribbean Island. The instructor there refused to accept the referral because each item was not initialed. The student called the shop, and the shop explained that the instructor had properly signed the form. Nope. They contacted PADI in America, and PADI told the French island dive shop that the form was indeed correctly filled out according to its planned design, and that design was used throughout the world. Nope. The French instructor said his agency was PADU Europe, not PADI America, so they couldn't tell him what to do, by golly. Incredibly enough, PADI Europe backed the French instructor, even though he was clearly wrong about a form they used, too.
As a result, at our shop, we were all required to put our individual initials, instructor numbers, etc. on every blasted line of the SRF, because you never know when a French instructor is going to require it.