RDP:Why would one go to a quarry during student high-tide and expect vis!
Maybe because you have Saturday and Sunday off work like most every one else.
I doesn't matter how much time is spent training in a pool prior to OW check dives.
I disagree. It matters very much how much time is spent in the pool and what is taught there. It's more than possible to teach a class without trashing the site. I've done it and I've seen others do it. Shops, instructors and agencies choose to not teach the skills that enable a student to avoid stiring up the bottom. Just because most don't doesn't mean that they can't.