Is there a crickets smiley?...
Expectations and regard for this ethic seem to vary widely, perhaps as matter of local maritime culture and law, and from what I gather, an incipient legal distinction exists between scuba-by-boat and boating, the development of which has created a muddied body of law (as if that's new I suppose).
This is a very valid point, and should be extended to all aspects (where reasonable) of international diving/travel.
Often there is an assumption that the rule/type of law in one's home country is the same around the globe. I am an expat living in a Muslim country and the Sharia (Islamic Law) courts are very different from any "Western" laws that I am accustomed to; accordingly my family and I are aware of the "high impact" differences and are sure to stay well clear. The difficulty of course is that often, on the surface (so to speak), it looks no different however, when you become part (by choice or accident) of the legal wrangling here, you can very quickly get caught in a web of huge cultural difference with potentially significant negative ramifications. This example may reflect one of the extremes of the point, however it serves as a real situation.
This is probably only remotely linked to this topic, but it is worth some consideration when discussing expectations and possible outcomes regarding matters that may have some legal bearing at any time.
Best Regards
Richard