Addicted2H2O
Contributor
Well, Night is one of the standard AOW dives up here. One night dive, with a decent briefing on proper light procedures, is about what a decently intelligent student needs to know to start night diving.
When I took my AOW Night, Deep and Nav were compulsory with that op. In addition, I got Boat and PPB. Of those, I'd say that Night was the most useful. The other stuff (except being certified to go deeper than 18m) I'd already learned pretty well by just diving. But then I had a few dives under my belt between my OW and my AOW. I have the impression that not everyone has that, and if you take your AOW pretty shortly after your OW a few more of those adventure dives may be useful.
But again, you're not really so much learning skills. Every OW class I've been involved with introduces NAV as the last dive to complete the course. Maybe they're not extensive work done on it as it only requires a swim out and back for a certain number of fin cycles to complete the skill. But still in the AOW course you've already "learned" the skill; you're just improving on it. Maybe I'm looking at it wrong, though.
@tursiops Yes you do have a point. Diving an AIR profile and breathing EAN is definitely going to be a better option than using AIR on an AIR profile or EAN on an EAN profile. But as has been mentioned, when diving EAN (even on an EAN profile) on a normal rec dive, gas volume is usually going to limit the dive before NDLs are ever an issue, so less nitrogen is typically going to be onloaded either way. At least that's been my experience so far. Again, maybe I'm wrong and I'm certainly open to criticism, especially from those that have much more diving under their belts than I do. So your point of view of definitely appreciated my friend.