I want to take a Tech Course, mostly just making deep open water dives (non pentetration dives to 132+). I have very good scuba equipment for single tank diving. I assumed a set of doubles would be needed but the instructor said doubles are out they don't use doubles but side mount systems only. The shop requires I take a side mount course ($400+) and a DECO dive course ($?) prior to the tech course itself. I dont know any tech divers so I wanted to know if the side mount only requirement is customary or is it the shop trying make more sales.
Doug
Doug