Scuba Diving Equipment Review: Northern Diver Guardian BCD I remember surfacing after a 90-minute dive in Scotland's Loch Long, cold water streaming off my suit, and realizing I'd completely forgotten what BCD I was wearing—which is the highest compliment I can give any buoyancy compensator. The **** had simply worked, without demanding any mental bandwidth or physical adjustment, through a dive that involved navigating kelp, maintaining precise depth control around a silty wreck, and dealing with surface chop that had half our group struggling with their jacket-style BCDs. This scuba diving equipment review of the Northern Diver Guardian BCD comes after five months of testing across cold-water wrecks, tropical reefs, and everything between—and it's earned a permanent spot in my kit rotation. The quick verdict: the Guardian is a back-inflate wi ...