If you want to go "Deep", take a tech class on deco procedures.As I've said on the many past threads about this, your MSD means something because these specialties improve either your diving or safety. As opposed to some others you could also take and still get the MSD.
"Drift" is a pretty useless cert in my eyes. Same with "Boat". "Shore" might have some merit if you encounter lots of surf.
"Multi-Level" is no longer being offered as there is no wheel. Again, Deco procedures cover all of this.
"NitrOx" is always a good class.
"Underwater Navigator" can be good depending on the instructor. Often, it's the blind leading the blind. Find a Boy Scout to teach you how to use a compass. Join an orienteering club to really learn it.
A great class would be "Rescue Diver", which is a misnomer.
Others would be "First Aid" and "Oxygen Provider", though they won't improve your diving.
If you really want to improve your diving, adding huge amounts of added safety and fun, please, please, please take a cavern course. You might never get into cave diving, but the principles, the trim, the buoyancy, and the mindset are a real gamechanger for most any diver. Best part? They have cookies!
I'm not trying to put dampers on people getting out and diving or even taking training. Join a local club. Find a good dive buddy, maybe even one that can mentor you. Better, if they can dementor you.
