Certified divers are able to rent equipment and go diving wherever they feel comfortable doing it. On most bareboats, safety is the charterers own responsibility. The charterer (and a buddy) pick a site, take the boat there, don their gear, and dive. When diving off a crewed yacht, responsibility, because of how maritime law views the captains role, skews toward the yacht. In an informal inquiry, most crewed-yacht captains agree that its in the best interest of the yacht (and ultimately that of the diving guests) that the yachts diver be at least a divemaster, and therefore qualified to lead a dive. Better yet, the diver whos also an instructor can guide charterers through dives and study to elevate their qualifications.